The Cutting Room Floor:Content to expand

Hi! This is a list I'm making as a sort of dump of things to be added that don't have full pages yet. Sort of a "I know there is something here, but we need to work on it" type of things. These pages don't even have articles; if they did, this would be better with something like Template:Investigate and/or Template:Todo.

If you know of something in a game that's not here but don't have enough knowledge to write about it (and there's no article, or the article really sucks) feel free to add something to the list here and hopefully somebody can look at it.

Items on this list should be removed whenever they've been sufficiently documented and article-ized, with any remaining information put as templates.

Link's Awakening sums it up best: Here is your clue. Make all the red blue.

iOS

 * Angry Birds has leftovers from Angry Birds Magic and unused graphics.
 * Bejeweled and Bejeweled Blitz have quite a bit of unused content in main.rsb.
 * Bubble Bobble Double has several unused Japanese text files in need of translation.
 * Kick Ass: Destroy the Web has a changelog and a placeholder graphic.
 * Indiana Stone: The Brave and the Boulder has a bunch of interesting voice clips which reference Hercules and several other things.
 * LEGO Ninjago: Spinjitzu Scavenger Hunt and LEGO Ninjago: Rise of the Snakes have unused text strings, models and other stuff.
 * Ms. Pac-Man has placeholder graphics.
 * Skylanders Battlegrounds and Skylanders Lost Islands have a lot of test files.
 * Apparently the app version of BTD5 (or maybe it was another phone iOS) for the apple phones have level editor icons. There may be a level editing mode, but all that has been found is the buttons, so we do have something to put on here.

Apple II

 * According to programmer Steve Baker, Sporting News Baseball has "hidden secret pics and animations, but it’s been so long I have forgotten the "keys" (to activate them)."

Macintosh

 * Angry Birds has some unused graphics, leftovers from other versions and unused text. Investigate what DebugConsole.lua does.
 * MilkSnake has unused text from here. Breaking the game (how?) gives you a million points.
 * Osmos has some unused text.
 * Quinn - replacing ConnectPanel.nib with DebugPanel.nib will open a debugging window when clicking Connect to Server.
 * Ferazel's Wand has some unused music, possibly more.
 * SimCity 2000 has some unused sprites for a parachute jumper; these are apparently exclusive to the Macintosh version of the game. See here.

400/1200XL

 * Lots of Easter eggs in various games (mostly developer messages) can be found here.

2600

 * The original Atari 2600 has a place for a built-in ROM chip and space for stereo speakers.
 * Lots of Easter eggs in various games (mostly developer messages) can be found here.
 * Bridge - the first few copies had a glitch that caused the game to crash. This version hasn't been dumped yet.
 * Centipede has leftover graphics from Galaxian.
 * SwordQuest: Earthworld has an alternate version with different clues.

5200

 * The Atari 5200 BIOS has the message "copyright atari" in the ROM. Is this used?
 * Lots of Easter eggs in various games (mostly developer messages) can be found here and here.

7800

 * Joust has a developer message.

Jaguar

 * The Atari Jaguar BIOS has a memory track editor, while the Atari Jaguar CD BIOS has effects configuration.
 * BattleSphere has a cheat mode.
 * Cannon Fodder has extra options.
 * Defender 2000 has several interesting codes.
 * Flip Out has a level select and pictures of the programmer's heads.
 * Hover Strike has several interesting codes, some involving debugging features.
 * Hover Strike: Unconquered Lands also has several interesting codes, some involving debugging features.
 * Iron Soldier has lots of interesting codes.
 * Iron Soldier 2 also has lots of interesting codes.
 * I-War has bonus options.
 * Kasumi Ninja has a cheat mode.
 * Myst has several pictures of the developers.
 * NBA Jam: Tournament Edition has lots of secret players.
 * Pitfall: The Mayan Adventure contains the original Pitfall.
 * Primal Rage has hidden options.
 * Super Burnout lets you view its version number.
 * Tempest 2000 allows use of a never-released rotary controller, and has a cheat mode.
 * Trevor McFur in the Crescent Galaxy has a cheat mode.
 * Ultra Vortek has several interesting codes.
 * Val D'Isere Skiing and Snowboarding has bonus options.
 * Wolfenstein 3D has a sound test and a level select.
 * World Tour Racing has a track editor.

Lynx

 * Basketbrawl has a code that lets you play as Michael Jordan, plus a code for editing the pause message.
 * Batman Returns has a cheat mode.
 * Battlewheels has several interesting codes.
 * Battlezone 2000 has a hidden version of the original Battlezone.
 * Chip's Challenge has a hidden mandelbrot generator accessible with the password.
 * Crystal Mines II has a level select.
 * Electrocop also has a level select.
 * Hockey has bat comics?
 * Ponx has some interesting codes.
 * Power Factor has a level select.
 * Rampage has a level select and a picture of the head programmer.
 * Switchblade 2 has a cheat mode.
 * Toki has a photo of the development team.

Atari ST

 * These pages mention some hidden messages in several Atari ST games.

Commodore 64

 * This thread from 2008 mentions a lot of unused things in various C64 games (sprites, hidden messages, other crap). Someone with better knowledge of old C64 games than me should check this thread out (I only code the C64, I don't play it...). The guy who ran The Games That Weren't has a blog post about this, plus more.
 * A tape loader used in various games (Sanxion, Mega Apocalypse, etc.) apparently contains the string "HACKERS FUCK OFF AND DIE" (of course this doesn't show up in most/all of the cracked versions that have completely different loaders). By extension, the string probably appears in a number of different games. I wonder how that should be handled?

Commodore Plus/4

 * Quite a few games have hidden text.

Amiga

 * Ambermoon is the sequel to Amberstar RPG, and you could invite some of the developers into your party inside the cheatroom.

PC

 * Pretty much every Humongous Entertainment game ever made.
 * Every Windows Vista/7 game has a debug mode which can be enabled with registry tweaks. (Todo: check the Windows 8 games [Microsoft Solitaire Collection, Minesweeper, Microsoft Mahjong, Wordament, Taptiles, Adera])
 * Every MSN Zone game bundled with Windows XP and ME has commented out text in the config file. There is also data for a debug menu containing two items: Event Spy and DataStore Viewer.
 * What does changing fDebugWindow="0" in any of the Living Books games' decription file (*.512 or *.LB) do?
 * Age of Empires II may have unused graphics, and there's an alpha version.
 * Anodyne has some demo leftovers within the AIR archive (see ".gitignore", "index.html" (references a "Seen.swf"), and "META-INF\AIR\application.xml")
 * Atari: The 80 Classic Games has several unused games.
 * Civilization II has the unused Plumbing tech, and entries in CITY.txt for the Incas and Arabs, which aren't available civilizations. Also, content available for scenario building (a "Modern Alt." city icon in CITIES.gif, extra unit slots and designs) which aren't used in the main game. (All of this is in at least the MGE version, and probably other releases.) Note that the PS1 version already has a page.
 * Civilization III has unused assets for an Austrian civilization.
 * Colin McRae Rally 2005 has a lot of test files and test tracks to check out.
 * Commander Blood has some unused movies and graphics that would later be used in the French-only sequel Big Bug Bang.
 * Curse of the Azure Bonds seems to have had several changes through it's versions, the most noticeable one I can recall is the removal of music in the title screen on the later versions.
 * Dark Souls has a TON of unused gear and voice recordings. (There's even dialog for the DLC fight with Artorias.)
 * Deus Ex has some scrapped missions. According to DX Wiki - At some point during the Deus Ex development, there was a mission in which JC Denton would have been asked to travel to the moon to confront a rogue, malevolent AI named Ada, but much like the scrapped White House and Texas Border missions, the moon level never made it into the final game.
 * Dracula II: Ascension has a test.sav in the game files.
 * Eversion has some unused eversion levels pre-1.7.3, as seen in this video. Using a level editor shows that there might be one more...
 * Eye of the Beholder was rushed, leaving a clearly unfinished ending, and some items and level sections which apparently were going to be used on the full ending. There is a fan patched version (v1.9) which restores a bit of it.
 * Fallout Tactics: Brotherhood of Steel has weapons, missions, perks, and miscellaneous items.
 * Final Fantasy XI has unused spells and levels. Example.
 * Gold Box games in general (these are the old SSI D&D games such as Pool of Radiance). There are several debug line commands as seen here. It is curious that some of them serve to skip the copy protection, yet were left on the commercial versions.
 * Half-Life has differences between the PC and PS2 versions. Also unreleased DC version has some different models and maps. Some of DC changes made it into PS2 version.
 * Half-Life Opposing Force has several unused dialogue in intro and some NPCs like Otis, Grunts and Drill Sergeant have unused dialog as well.
 * The Hall of Tortured Souls (hidden game in Excel 95) has a picture of the developers accessible by doing a 180 degree turn and typing EXCELKFA.
 * Hover! has prototypes.
 * Iji: an early build was released on March 21, 2011 as part of Scrap Pack 2.
 * Island Xtreme Stunts has a cheat mode and a cheat menu.
 * Ishar when played on DosBox 0.74 gets a weird glitch, it shows a language selection screen which shouldn't appear, as far as I know this game is only in English. Were the translations scrapped? Are they just currently lost but the English version contains files for other languages?
 * Jazz Jackrabbit has possibly unused boss levels with definitely unused abusive messages outside the level boundaries.
 * Jazz Jackrabbit 2
 * Lots of unused graphics.
 * "OEM Version" proto.
 * Knights of the Old Republic 2 has lots of unused content in general (the ending's a good place to start) and definitely needs an article.
 * LEGO Bricktopia has some interesting cheat codes.
 * LEGO Chess has unused text, sounds and graphics.
 * LEGO Creator might have some unused voice samples. It also has a mostly unused copy of Superscape 3D Control 5.51, which will only launch as an ActiveX contro.
 * LEGO Racers 2 has some unused sounds.
 * LEGO Rock Raiders has a debug mode.
 * LEGO Stunt Rally has some unused track pieces.
 * LEGO Universe has unused NPCs and music, and possibly more. Document the beta of this game.
 * Lemmings (PC) has lots of demos with a single new level, exclusive to that demo. Also if I'm not wrong, the last level is exclusive to each system, so the PC and Amiga versions have a different last level. Also the version can be checked using "VERSION" as level code, but for some reason the earliest version of the game won't recognize it. Maybe they didn't plan to make newer versions?
 * Lemmings 2: The Tribes (PC) has a demo version that clearly dates to en earlier stage of development and has a number of scrapped features. (There also seems to be an Amiga demo that is slightly further along.)
 * Mario's Game Gallery was rereleased as Mario's FUNdamentals. I also remember a version with a slightly different menu.
 * Mark of the Ninja has debug and test level folders in data-pc\levels.
 * Mega Man 3 has unused graphics.
 * Metal Gear Solid 2: Substance has placeholder texture for Otacon's full-body model (found within *cdrom.img\face\f04a\,"\f04b).
 * Odium (aka Gorky 17 for you crazy Europeans): I've only taken a quick glance at the game files. There was lots of commented-out dialogue and some removed enemies, but I haven't played that game for so long... There's definitely unused goodies to find in there, though.
 * Operation Flashpoint: Cold War Crisis (...I think) has an anti-piracy trick.
 * Pac-In-Time has leftovers from Fury of the Furries.
 * Pac-Man: Adventures in Time has unused .tod level graphics.
 * Re-Volt has some pretty interesting stuff in leaked source of it.
 * Ride to Hell: Retribution The game basically is a debug menu.
 * Saints Row: The Third has a leaked DLC list that includes a "co-op" pack, which hints co-op mode originally wasn't to be released with retail.
 * Saw has some unused content, like some unused player characters and Dr. Gordon's scrapped appearance.
 * Septerra Core: Legacy of the Creator
 * Unused items.
 * Debugging functions.
 * Shank and Shank 2 have debug and test level folders in data-pc\levels.
 * Shrek 2; being a KnowWonder game; has a debug mode, unused/cutscene-only maps and plenty of placeholder/unused textures.
 * SimCity 3000 has unused music from SimCity 2000.
 * All the Sims titles have unused... bits of everything. See The Sims Wikia and Mod The Sims for user-recreated/found objects, textures, etc.
 * The Sims: More accessories and graphics.
 * The Sims 2: Ditto.
 * The Sims 3: Double Ditto.
 * The Urbz: Sims in the City: I don't even know, but the Wikia indicates there's accessories here.
 * The Stanley Parable Demo has a lot of unused content, including early narrator dialogue, unused textures, and a developer message in cup.vtf.
 * SuperTux has some unused graphics.
 * Sveerz - extracting the .SWF from the game's executable and decompiling it reveals unused logos of several game publishers and unused text. The final frame of the .SWF is a button test.
 * Temple of Elemental Evil: A Classic Greyhawk Adventure: being a Troika game, a number of things got cut in the rush to market on top of general buginess. Examples include the children of Hommlet and the Snake Pit in Nulb. These are restored in the "Circle of 8" mod series.
 * Terrordrome - not finished yet, but demos (v2.5, 2.6, 2.7, and 2.8 as of October 2012) can be found on sites such as Mediafire with differences. Official site here.
 * Tobe's Vertical Adventure has unused enemies and test levels.
 * Tomb Raider: Angel of Darkness has lots of unused voices, including some for a tutorial. There are also unused items.
 * Trial version of Touhou Youyoumu ~ Perfect Cherry Blossom has version differences.
 * Tux of Math Command has lots of major version differences.
 * Ultima VII Part Two: Serpent Isle
 * A number of things got cut and some areas are unfinished. Partially documented over on The Codex of Ultimate Wisdom.
 * Nakar explored some of this stuff, like the permanently-locked door in Skullcrusher.
 * Unreal Tournament 2004
 * There are a shitload of unused models from a very early Gears of War, back when it was called Unreal Warfare. Models, textures, propaganda poster textures showing early COG designs, you name it; it's there. All of them are viewable in the editor, so it should be easy.
 * An unused Onslaught ladder for SP exists. Check it out and see what levels are in it and how playable it is.
 * Worms 3D has a couple of weapons that only appear in some versions, or don't appear in any version or... or something like that. Examples include the Ming Vase, Concrete Donkey, and Mega Mine.
 * There are some unused soundbank speeches in Worms 2, Worms Armageddon, and/or Worms World Party (needs more research).
 * Poker Night 2 may have unused audio, these unused clips have already been found.
 * X-Com: UFO Defense has at least an early demo showing the original title (X-COM: Terran Defense Force). Also the several versions and releases of the original game may show various changes.
 * U.B. Funkeys had some Funkeys that were unintentionally unplayable, including Dot's Rare and Very Rare variations, Normal and Rare variations of the regular Paradox Green Funkeys, and Bandit.

Xbox

 * Halo (Xbox) has an unused enemy, the Covenant Engineer. Also, there's a flamethrower that was later used in the PC/Mac version.
 * Jet Set Radio Future has a katana model left inside the game's files, which Officer Hayashi was originally going to use as his weapon before the developers decided to make him use a pistol instead.
 * There is also a rumor that there are three incomplete characters whose files are left in the Japanese version, but were removed from the localized versions. The characters' names are reportedly Wave, Numa, and Check.
 * The Doom Riders and NT-3000 (the robot designed to look like Yoyo) are named differently in the files, implying that the names used in the files were their beta names. The Doom Riders are called "hellmets", and NT-3000 is called "yoyoB". Also, Rhyth and Boogie are still referred to by their Japanese names in the files. ("bis" and "sugar")
 * Conker: Live & Reloaded have unused text.
 * Futurama has this line in its default.xbe C:\Code\Futurama\Futurama\Build\XBoxMaster\Futurama.exe

Xbox 360

 * Because Nuts & Bolts spent so many years in development hell and changed from a platformer to a car,game, it should propapably be checked.
 * Mass Effect 3 has a beta leak?!? Video.
 * Wheel of Fortune has a ton of unused voiceovers that likely also apply to the 2012 PS3 version (due to THQ's bankruptcy in December 2012, these are unlikely to be used in DLC).
 * Puzzle categories that are rare (Headline; Fictional Family shortly before it was merged with Fictional Character{s} into simply "Character{s}"), haven't been on the show in years (Best Seller; What Are We Making?), or never existed on the show (Classic Rock; Where Are We Going?). Among these are eight former categories well-known for offering cash bonuses, including Next Line Please, Where Are We?, Who Is It?, and Slogan. It should be noted that the categories present in the game are taken directly from the show's official category list, given to contestants...which is clearly outdated.
 * Variations on "Sorry. All the consonants are gone and no one solved it. That money will go unclaimed." This is used in the Wii U version if everyone has less than $250 and cannot solve the puzzle, though.
 * Wheel dollar values that either don't exist ($475; $4,000; $10,000) or have not been on the show in decades ($275; $2,000).
 * Intro voiceovers of "Something seems strange. Have we been here before?" and "Well, now this brings back some memories.", labeled PAT_BANTER_INTRO_RETRO. (These might be used in the "1980s set" DLC, though.)
 * All of the above sound files are Pat's. Vanna's sound files contain explanations for a minigame called "Pick One", and mentions both Circle Pads and Analog Sticks; this may indicate that a 3DS version was in the works at some point.

Windows Phone 7

 * COLLAPSE! has lots of unused text.

Windows CE

 * Solitaire (which version?) has hidden developer credits.

NES

 * Lots of released prototypes from Lost Levels
 * All Night Nippon: Super Mario Bros. may have leftovers from Super Mario Bros. The Lost Levels, as it runs on the same engine.
 * Not known but a request (from andlabs): does the Famicom version of Choplifter contain any removed references to Sega? It's closer to Sega's 1985 arcade version than any of the other versions.
 * Dragon Power had some changes compared to the Japanese and French versions.
 * Doki Doki Panic probably has unused stuff other than the smiley sprite.
 * Excitebike contains two options on the Design menu, Load and Save, neither of which are operable in the NES version. Apparently they were intended to be used with a storage device that never saw the light of day (possibly a tape drive, seen in early NES mockups). Both options are fully programmed and would function as intended if this device were present. The loading and saving system was added to the 3DS 3D Classics version. In addition, the Load and Save options are completely absent in the Animal Crossing version.
 * Jeopardy! has an unused Coca-Cola logo, much like Wheel of Fortune. GameTek's other game show titles might have unused stuff as well.
 * Kid Icarus has a lot of FDS -> NES differences. This has most of em, but there seem to be a lot of different FDS wavetable-enhanced sound/music like with Zelda/Metroid judging by the TAS I watched, assuming the sound effects in the 3DS 3D version are the FDS ones. (Rather likely, since the noise when you put Kid Icarus: Uprising is a jingle that matches the 3D version and not the NES version.) Also, apparently they fucked up the password system on the Virtual Console port?
 * Lunar Ball (NES) - this NSF - is track 15 used? (Pointed out to andlabs in IM by Sik, who "had that game since I was 3 years old".)
 * Mother has some early graphics/version differences with the English prototype. Some info is here and here.
 * NES Control Deck Test has lots of unused graphics. (Note: This is not the same cartridge as Control Deck Test Cartridge.)
 * Solstice has lots of content in two YouTube videos, showing development of the game itself: here and here.
 * Super Mario Bros. 2 (Japan) has a few differences between the original FDS version and the GBA (Famicom Mini) version. Namely, the load times in the GBA version were shortened (such as when loading World 5-1, World A-1, and the ending sequence) and the GBA version requires the player to press B + Start on the title screen to enter World A-1 instead of A + Start as in the FDS version.
 * Totally Rad has a LOT of regional differences not yet in the wiki.
 * Ultima III has some unused NPC sprites, including a jester.
 * Wario's Woods has regional differences and unused music.
 * Yo! Noid has major regional differences.
 * Do any of the following have debug modes? This follows from my (andlabs') observation that early Now Production games (at least on the NES and Genesis) all have debug functionality left in:
 * Metro-Cross
 * Wagyan Land
 * Yo! Noid
 * Wrath of the Black Manta has an entirely different soundtrack and graphical style from its Japanese version, Ninja Cop Saizou, among a few other differences.

NES (Unlicensed)

 * Most of Hummer Team's fighting games have unused characters.
 * Doraemon has some unused graphics, some of which are Somari leftovers.
 * Earthworm Jim 3 has lots of unused music.
 * Harry's Legend has lots of unused graphics and a couple unused enemies.
 * Mortal Kombat III has source code in the ROM.
 * Mortal Kombat 4 has leftovers from Titenic.
 * Pocahontas - a debug rom has been leaked here.
 * Pocket Monsters Red, Pokémon Gold, and Street Fighter II: The World Warrior have some weird unused text.
 * Pokémon 4-in-1 has some source code in the ROM.
 * Poké Tetris has unused text leftover from a multicart.
 * Rocman X has graphics leftover from Thunder Blast Man and an unused attack.
 * Titenic has a huge amount of unused content: unused graphics, debugging features, an internal list of characters, unused enemies and possibly more. More info here.
 * Spiritual Warfare "QUACK! super secret bonus room" text inside.
 * Super Contra II
 * Unused menu leftover from a 17-in-1 cart by Super Technos.
 * There is an unused level select, too.

Game Boy (Color)

 * Spot: The Cool Adventure has regional differences.
 * Woody Woodpecker Racing has regional differences. The Nintendo logo goes unused in the Japanese and European versions, and all of the Japanese characters from the name selection screen go unused in the American and European versions.
 * Does Shin Megami Tensei: Devil Children: Shiro no Sho (White Book) have anything, like its counterparts?

Game Boy (Color) (Unlicensed)

 * Harry Potter 3 has graphics for a...clown?
 * Pokémon Adventure has some early (and creepy) graphics for Pikachu.
 * Pokémon Jade crashes after the first level, leaving almost the entire game unused. There might be leftovers from Sonic Adventure 7.
 * Shui Hu Shen Shou has menu icons leftover from Pokémon Gold and Silver
 * Thunder Blast Man has a few sprites leftover from Rocman X Gold

SNES

 * Aero the Acro-Bat 2 has unused text strings starting at : LIVES ON LIVES OFF and ENERGY ON ENERGY OFF, which were used for a cheat in the Genesis version. There isn't any code left that points to these strings, so the functionality probably no longer exists.
 * Aretha - gedowski documented some of the debug mode here.
 * BioMetal has regional differences, including an odd one with the soundtrack (US/EU versions have an SNES-chip version of 2 Unlimited's "Get Ready"...no joke).
 * Clock Tower
 * Some unused items.
 * "Changed" graphics like the below, at least one of which is the hole in the wall where Jennifer's dad is.
 * CutThroat Island PAL version has French, German and Spanish languages, but no language select option anywhere? USA version, too?
 * Famicom Tantei Club: Part II
 * We need to figure out read that text; Tomato told me about it long ago, but I never found it.
 * There's a lot of "changed" graphics using sprites in some places; e.g. a background clock replaced with a sprite one.
 * Judge Dredd has a preview version from CES 1995, with several stages and other things that were deleted from the final, as well as various other changes.
 * Mario Paint has a prototype.
 * Super Mario All-Stars + Super Mario World may well have unused World and/or All-Stars stuff, or possibly removed some from either half to make room.
 * Wario's Woods has unused graphics.

SNES (Unlicensed)

 * There are several unlicensed SNES games with interesting anti-piracy features.
 * Digimon Adventure and Pokemon Gold Silver have leftover graphics from A Bug's Life.
 * Pokemon Gold Silver has leftover text from Lemmings and unique anti-piracy measures.
 * Super 20 Collection (a compilation of NES ports) might have some unused content leftover from the original games.

Nintendo 64

 * Command and Conquer supposedly has a debug mode, but I can't get it to work. Anyone with better dexterity wanna give it a try?
 * Conker's Bad Fur Day has two prototypes.
 * Jet Force Gemini is supposed to have some kind of test map. Also, there's a kiosk demo that has some differences from the final.
 * Ogre Battle 64: Person of Lordly Caliber has a bunch of unused stuff; some can be found in this GameFAQs guide.
 * Quest 64 has some unused music. Check the USF rip for a starting point.
 * Superman has a beta, some remnants in the final game from said beta, some textures supposedly taken from GoldenEye 007, and given how much of a cesspool the game is, it most likely has more stuff.
 * Turok 2: Seeds of Evil has an awesome demo version. There's a good article on it here.
 * Wheel of Fortune
 * The Surprise wedge appeared in prerelease screenshots and the instruction booklet, but isn't present during gameplay. It might still be in there, just dummied out.
 * Possibly other stuff; this was GameTek's last Wheel game, released seven months before the company closed down, and there are quite a few weird things with it (likely-incomplete list here) that may suggest the game was released in an incomplete state.

Game Boy Advance

 * Drome Racers has several interesting cheat codes.
 * LEGO Racers 2 has a prototype with lots of differences.
 * Golden Sun and Golden Sun: The Lost Age
 * Debug areas, at least.
 * Several unused items in the first game. Even if you can get them in the sequel, they're still unused.
 * Could probably use some fine-toothing here, too.
 * More research in general; the articles need some serious expansion.
 * Mother 3 has loads of unused stuff.
 * Unused menu the English fan translators undummied.
 * More music.
 * Levels.
 * Sprites.
 * Text.
 * Sonic Advance has a prototype.
 * Sonic Advance 3 also has a prototype.
 * Sonic Battle has regional differences.
 * Space Invaders has regional differences and text for a debug mode.
 * Spirits & Spells has regional differences.
 * Super Mario Advance is Super Mario Bros. 2 and has been looked into already, but could probably use some finer combing.
 * Super Mario Advance 2 is Super Mario World and might still have the SNES version leftovers, or maybe something entirely new.
 * Super Mario Advance 3 is Super Mario World 2: Yoshi's Island with some new levels...might not be anything, though.
 * Super Mario Advance 4 is Super Mario Bros. 3, and I know it has a screen for a debug menu, even if the menu itself hasn't been found.

Game Boy Advance (Unlicensed)

 * Digimon Adventure has an unbeatable final boss (is there an unused ending?) and unused graphics for transforming into Greymon.

GameCube

 * Ralf of GSCentral has found so much stuff in GameCube games. Pretty much any PAL GC game he's gone through has something wiki-worthy.
 * Cars has some debug features.
 * Eternal Darkness: Sanity's Requiem has E3 demo menu graphics.
 * Metroid Prime has a ton of revision and regional differences. These have been documented at Metroid 2002, but having higher quality video (or screenshots where they'll suffice) in the article would be great.
 * Metroid Prime 2: Echoes also has some differences, mainly in the Japanese version, although the PAL version has some too. Samus.co.uk had these documented, but pretty vaguely.
 * Pikmin has a lot of stuff. It's best to just go here.
 * Rayman 3: Hoodlum Havoc has an incomplete mini-game called "2D Nightmare".
 * TimeSplitters 2 has an unused Gothic MapMaker tileset accessible with AR codes. IIRC there are also unused weapon models and the sci-fi handguns with alternate tracer colors used by the aliens in the Planet X mission can be used by the player.

Wii

 * The console itself had some early plans for the Virtual Console. Maybe there's more hidden things in the Virtual Console files?
 * Plenty of games re-released on Virtual Console have revision differences.
 * Arc Rise Fantasia
 * Ten(!) test rooms that need to be file swapped to work.
 * The US version actually added more voice acting for battles.
 * Castlevania Judgement
 * Initialization test text.
 * Leftover menu/HUD graphics from Naruto: Clash of the Ninja - Revolution.
 * Early stage copies.
 * Placeholder graphics.
 * The Conduit has a test room only accessible through private online multiplayer and cheat devices, as well as a early version of Sanctum, and a debug mode. Also, leftovers from the scrapped LAN multiplayer exist and can be undummied out.
 * Doc Louis's Punch-Out!! has music for when Doc Louis is knocked down, which goes unused since he instantly gets knocked out after losing all of his health.
 * Donkey Kong Country Returns supposedly has an unused 4-player mode.
 * Fire Emblem Wii has much more regional differences that I can think of.
 * GoldenEye 007 has unused maps, including an untextured port of the original Dam geometry from the Nintendo 64 game.
 * Kirby's Epic Yarn has plaintext setting files on the disc which suggest a lot of debugging options left in the game.
 * It is said that early in Madworld's development, the second boss, Jude the Dude, was going to be killed in a different way than from how he is killed in the final version. Check to see if the files from the original death are still there.
 * Mario & Sonic at the Olympic Winter Games also has several unused/unplayable characters.
 * Mario Sports Mix has lots of unused models and textures.
 * Monster Hunter Tri has many unused icons.
 * No More Heroes and No More Heroes 2: Desperate Struggle have censored violence in their Japanese and European releases.
 * Pokémon Rumble has text and data for a debug menu.
 * Sonic and the Secret Rings has some test files and some test videos (maybe not unused).
 * Tales of Graces has dummied-out artes: Sophie's Final Fury and Blast Heart, and Cheria's Innocent Shine and Meteor Storm. Either playable or sound-only, there is a huge amount of them. There also seems to have traces of a certain "DEVD," thought to be a missing character (much like PAT in Vesperia). It has also revisional differences.
 * Wacky Races has a test track and an errordummy.txt to check out.
 * The Wii series:
 * Wii Sports Resort, Wii Party, Wii Play: Motion and Wii Fit all have unused graphics.
 * Wii Chess has regional differences.
 * Wreck-It Ralph has some test rooms. Check if they work.
 * A small number of demo discs (very small, almost definitely under ten) were produced. Some of these are "Activision Exclusive Playable Demo Disc" with demos of Big League Sports, Dancing with Stars: Get Your Dance On, Madagascar: Escape 2 Africa, Monkey Mischief, and Shrek's Carnival Craze; individual discs for Boom Blox, Help Wanted: 50 Wacky Jobs, Monster Hunter Tri, Muramasa: The Demon Blade, Rooms: The Main Building and Sonic and the Secret Rings.

DS(i)

 * This page has more stuff that I (einstein95) found. Stuff needs article-ised.
 * Brain Age 2: More Training in Minutes a Day have some unused graphics.
 * Cid to Chocobo no Fushigi na Dungeon: Toki Wasure no Meikyuu DS+ according to some sites has a debug mode, but others refer it as an enemy encounter cheat.
 * Club Penguin: EPF: Herbert's Revenge
 * Has some developer comments in dgamer.xml.
 * Also, figure out how to open DGamerArchive.fun and the .lzc and .arc files.
 * Chibi-Robo!: Park Patrol has development text strewn about all over, as well as text for what appears to be a debugging menu.
 * Cory in the House has a model viewer.
 * Drawn to Life: The Next Chapter
 * The version of The Next Chapter included in Drawn to Life: Collection alters the ending scene (I'm guessing this counts as a revisional difference?).
 * Elebits: The Adventures of Kai and Zero also has a test map (map_test00.pac) and an archive called test.pac.
 * Etrian Odyssey II : Heroes of Lagaard
 * Has dummy items, as well as blank items that is referred to (in red text) as "Weapon 256", ect.
 * Might have unused monsters and maps as well.
 * Final Fantasy Tactics A2: Grimoire of the Rift has unused Grenades type weapons from the unused Transmuter Nu Mou Job, which was to combine items for abilities, but with 19 usable items, there were over 300 combinations and therefore was scrapped at the last minute. Job might be in the game, but the Grenades are present and semi-useable.
 * Final Fantasy XII: Revenant Wings has debug menu text but it's no longer readable in non-Japanese versions, since it's all replaced with "????". It seems to have options for HP/MP. Also find a way to re-enable it.
 * Garfield: A Tail of Two Kitties has a lot of debug stuff.
 * KORG DS-10 Synthesizer and KORG DS-10 PLUS have lots of unused graphics.
 * Last Window: The Secret of Cape West, the sequel to Hotel Dusk, has a big archive called Main_Debug. Maybe it has a debug menu like its predecessor?
 * LEGO Battles and LEGO Battles: Ninjago have an unused level and some unused graphics.
 * LEGO Indiana Jones 2: The Adventure Continues has text for a debug menu; figure out how to access it.
 * LEGO Batman: The Video Game has text for a debug menu; figure out how to access it.
 * LifeSigns: Surgical Unit has a file named debug, probably an image, plus the Japanese Win graphic. Figure out how to open them.
 * Mario & Sonic at the Olympic Games, like its Wii counterpart, might have several unused/unplayable characters.
 * Mario & Sonic at the Olympic Winter Games might have several unused/unplayable characters.
 * Mario vs. Donkey Kong: Mini-Land Mayhem has a debug menu, some unused graphics, and a dummy sound effect.
 * Mario vs. Donkey Kong 2: March of the Minis has unused objects that can be used by hacking the level files.
 * Nanashi no Game: Me seems to lack some stuff from it's prequel, but might have other stuff?
 * Pokémon Ranger: Guardian Signs apparently has a test map.
 * Disney/Pixar Ratatouille: Food Frenzy has some unused graphics.
 * Rhythm Heaven has been reported to have hidden graphics, via Einstein95, maybe has some other stuff buried in there. (Unused minigames perhaps?)
 * Scurge: Hive - This and the following pages have plenty of Scurge: Hive sprites from one of the makers. There's lot of stuff I don't remember having seen in-game, except during a rare glitch I never managed to reproduce, can someone help me sort it out?
 * Sonic Colors has a debug map, like the other DIMPs Sonic DS games.
 * Super Robot Taisen W - could anyone re-enable the debug menu? The patch link was on Megaupload, I think.
 * Wheel of Fortune has the "bonus category" post-puzzle chimes (previously used as the "rolling doubles" sound on the 1987-88 High Rollers), along with some Pat Sajak lines that are used in the console versions.

3DS

 * Use Powersaves to look for content
 * Epic Mickey: Power of Illusion - it's painfully obvious they scrapped the whole Alice in Wonderland world, plus some levels here and there (link). There is bound to be at least unused spritework, but until we can peek inside 3DS ROMs we can't say for sure.
 * Mii Maker has regional differences.
 * Nintendo Video also has some regional differences.
 * Pokédex 3D has version differences (Pokédex 3D Pro)
 * Swapnote has some regional differences and revisional differences from updates. (The SpotPass termination may also count, because the app stealthily removed various SpotPass-related features and references.)
 * Paper Mario: Sticker Star has Unused text via a glitch. Also, due to the rest of the Paper Mario games having extensive unused content, the rest of the game should be checked, though that will probably require the as-of-yet-limited ability to look through 3DS ROMs.
 * Same with New Super Mario Bros. 2. It also appears to use the New Super Mario Bros. Wii engine, so it may have leftover objects.
 * Phoenix Wright: Ace Attorney: Dual Destinies has regional differences (check if a translated version of the quiz DLC exists in international versions).
 * Check for differences between the cartridge versions and the American download-only version.
 * Resident Evil: Revelations has two widely-available demos. One is included in Resident Evil: The Mercenaries 3D and is most likely a prototype. One is a downloadable demo on the eShop and may or may not be a prototype.
 * Style Savvy: Trendsetters has revision differences.
 * A bunch of other games have had updates, but which ones count as revision differences and which ones don't is anyone's guess.
 * Various games have downloadable demos, which sometimes have differences from the final game for the sake of length constraints and simply to show off various aspects of the game. Whether or not these should be covered is debatable, as it's unclear whether or not some of these are actually prototypes.
 * Bravely Default's demo could probably be covered as a whole other game, however, considering the fact that it is a whole other game.

Wii U

 * DuckTales Remastered has revisional differences.
 * Jeopardy! and Wheel of Fortune very likely have a plethora of unused images and such for the online gameplay features they trumpeted in promos and even on the boxes but never actually delivered. Also, given that these were THQ's last games before filing for bankruptcy a few days later (probably why they suggested the consumer pay $20 more for inferior products), they might have some other unused stuff that may overlap with those of the Xbox 360 and PS3 versions.
 * The Legend of Zelda: The Wind Waker HD may have some debug controls, used to create the "The Misadventures of Link" miniseries on Nintendo Video.
 * NES Remix (naturally) has Famicom-related regional differences.

Master System

 * The Sega Master System BIOS has a prototype.
 * Alien 3 supposedly has an unused Fox theme like the Genesis version (according to Tiido/TmEE anyway).
 * Rampage, due to being unreleased in Japan, has unused FM music and sound effects, because non-Japanese SMS units do not have FM built in. However, the FM music can be heard in an SMS emulator with FM enabled (set region does not matter), or on a real Japanese SMS by means of a region adapter.

Genesis
00038A:60    (bypass checksum) FFED84:30    (set game mode) 0065B6:4E71  (nop out rts blocking the menu)
 * Lots of Genesis games in general, thanks to drx.
 * The Sega Channel BIOS has multiple demo carts.
 * Animaniacs has unused music.
 * Aquatic Games might have some region differences. On my Mega Drive, in 100 Metre Splash, Pond makes some splashes on the water, as well as the accompanying sounds when he runs fast. This doesn't happen on Gens with the US version of the game. Region difference, or emulator flaw?
 * Dynoblaze has unused animation frames. See here and here.
 * Ecco the Dolphin and its brethren have loads of stuff in their prototypes.
 * Flicky has differences between the Genesis and Arcade versions. Worth noticing?
 * James Pond: Underwater Agent has two unused themes.
 * Micro Machines 2: Turbo Tournament has unused tracks.
 * Prince of Persia (Genesis) has some unused songs and some regional differences.
 * Sonic & Knuckles has a leftover palmtree sprite from Sonic the Hedgehog 3.
 * Toy Story
 * Has an MOD player and an MOD. Not cut, but still interesting trivia.
 * The MDO file has an unused portion, like a fanfare.
 * Also has an unused song, said to be used in the Roller Bob level in the PC version, like in the SNES version.
 * Looks like there are region differences too.
 * Wimbledon Championship Tennis has a debug mode.
 * World of Illusion (starring Mickey Mouse and Donald Duck) - lots of stuff here.
 * andlabs's "so I don't forget" list of things to look into:
 * Crusader of Centy's prototype, US final, and SK final has stuff from Beyond Oasis/The Story of Thor, which came out more than 6 months later (wtf)
 * Chase HQ II plays one song in the ending but Super HQ plays two? (region difference)
 * There's that unused item art in Madou Monogatari I that I found long ago but without knowing what the item palette(s) are it looks like a pile of shit (literally) :|
 * Darius II/Sagaia - GameFAQs doesn't seem to have a clear idea of what all the cheat codes are? Super Hard Mode triggers a string SPECIAL MODE, for instance... Also are zones Z1 and Z2 used? Also this
 * Chou Kyuukai Miracle Nine appears to have a debug menu of sorts:
 * Not sure if it is used or not or if it has an effect as pressing start after disabling the RAM code just brings you back to the menu, so I have to see if it's supposed to come from elsewhere by disassembling all the game's code :/


 * I'll probably remember this by tomorrow morning but: Final Blow has the red Taito logo; it's loaded to VRAM (also I have to see how strings are stored in that game; it looks like the game can pick and choose characters to load and where?)
 * Feng Kuang Tao Hua Yuan has a block of either unassembled helper code or compiler assembly output, not sure which... but the present dump is not from the original cart, but from a mainland China(?) "rereleasse" so I'll wait until we can get an authentic dump
 * Simple sound test codes... documented in the manual or not?
 * Mahjong Cop Ryuu - A+Start on title screen
 * Party Quiz Mega Q - A+B+C+Start on title screen
 * Crack Down - Japanese characters loaded in title screen? there don't seem to be any in the intro or on the title screen... or anywhere in the game...
 * Rugby World Cup 95 appears to have each of its functions suffixed by the function's name (like a symbol table but scattered throughout the ROM). Also "Dave Was Here!"
 * There's a flag that if set to nonzero, the game loop will enter an endless loop that cycles through each of the big-board animations that can show up; check at $13DA and loop immediately afterwards, checks -$6EA1(a5) where a5 is $69C (yeah it's one of those games)
 * Turns out many, if not all, of the Extended Play Productions games have these symbol setups...
 * Hellfire: "M2612 SOUND REAUEST TABLE           "/"ERRORS=0000"/"   0221         END"
 * bah it's located in the sound driver

pietro@pietro-laptop:~/ida_linux$ bgrep '0D 1E 0D 0E' Hellfire* Hellfire (Europe).md: 000120f5 Hellfire (USA).md: 000120ff
 * Also
 * for the hard ending text... but the EU version wasn't Seismic...
 * While investigating the M2612 thing:

00012BAE 67 76 30 3C 00 E1 22 3C  00 03 E0 00 34 3C 04 06 00012BBE 4E B9 00 00 5F 84 70 02  22 3C 00 03 69 A0 34 3C 00012BCE 03 F2 4E B9 00 00 5F 84  30 3C 24 06 32 3C 23 9A 00012BDE 74 0E 76 0E 4E B9 00 00  65 5C 23 FC 00 01 25 6C 00012BEE 00 FF 00 9A 4E B9 00 00  60 70 30 3C 00 10 22 3C 00012BFE 00 01 25 6C 34 3C 00 40  4E B9 00 00 5F 10 30 3C
 * this is nonsense for Hellfire (begins with a conditional branch to noncode, calls the middle of functions at non-entry points, and the last call jumps inside an opcode)
 * ...and is only in Hellfire (only in JP version)? something's not right here
 * not in arcade versions

; not the actual addresses as the data is copied to RAM [03:06] seg001:00FF0162 aSelect:       dc.b 'select',0 [03:06] seg001:00FF0169                dc.b '-',0 [03:06] seg001:00FF017B aToPlaceIn:    dc.b 'to place in',0 [03:06] seg001:00FF0187 aBuildingPorts: dc.b 'building ports',0 ... [03:07]  I don't recognize the term 'building ports', though [03:08] I wouldn't know [03:08]  Unused string? [03:08] it's in the list [03:08]  Indeed [03:08]  Hmm [03:08] so unless the specific index to get to that string is never loaded, then [03:09] I would need to find out which bytes are loaded into the code to look up strings [03:09] * Flygon should consider creating a Mega-lo-Mania fan-forum x3 [03:09] if the one that indexes that port string is never used... that string is unused and we have a mystery [03:09]  Indeed [03:09]  Good thing only one of the developers are dead... [03:09]  They appear quite cooperative to fan questions [03:10] http://www.gamefaqs.com/genesis/586569-tyrants/faqs/38544 check the author
 * Pac-Attack: are the credits immediately after puzzle mode?
 * shobiz found a lot of stuff in Quackshot
 * Jantei Monogatari has a button code on the main menu that seems to affect the starting state of the game in some weird way that I can't tell
 * Janou Touryuumon has a region check... that reports that it only runs on NTSC Genesis (instead of the correct NTSC Mega Drive)
 * Eliminate Down: A+B+C+Start during the minigame goes back to its title screen... is this documented?
 * Mega SWIV: word $80 is used as a flag to do something when you get hit by a bullet, but what?
 * Rainbow Islands Extra has a title screen cheat code: Up B Down Left C A A* B** C***. The last three buttons are so marked because you can stop at any one of those and only get the effects of the buttons you pressed. I *think* A makes you faster? I don't know... The code is checked on the main menu too. None of them appear to be related to infinite continues.
 * B button: [00:18]  Hey, i just tried that RI cheat code. i started off with Double Rainbows, but i don't know if that's normal for extra mode or not.
 * King Colossus: down up up down right left right left on the game over screen continues -- is this in the manual? even if it is, an additional right right is at the the end of the code, but the game stops after eight button presses
 * Mega lo Mania/Tyrants: Fight Through Time:
 * FAQ has no mention of ports...

[22:54]  don't forget the unused song, B G M 19
 * The Japanese version has bits and pieces of SNASM68K left in it
 * The later European version has, in its ROM header, a serial number field that indicates a CD version was in development? I need to check Sega CD headers
 * Mary Shelley's Frankenstein has an actual symbol table? (as opposed to Rugby World Cup 95)
 * Bonanza Bros. seems to have text for a stage select
 * Mega Bomberman - word at $2D8 in US version - if changed to a nonzero value, the CRAM is altered on every main loop cycle to show something (CPU usage debug?)
 * Socket
 * also various Unknown labels in GF64's disassembly


 * Pat Riley Basketball (at least the JP version) has a Sound and Animation Test; the sound part works but not the animation...?
 * Double Clutch has a cheat code it checks for right at startup! ...but my patch codes to hang the game when it checks the variable it sets when the cheat code is activated don't seem to do anything... does it happen when not in a race? I would need to beat a race to find out...
 * Find FRUITMEISTER I in an earlier Eurocom Genesis game (have t wait for SeanieB to finish changing Sega Retro hard drives before I can get a list)
 * No luck finding it in The Jungle Book (Genesis), all pause cheats are accounted for. TODO: check RNC (compressed) graphics --JLukas 22:28, 30 April 2013 (EDT)

Genesis (Unlicensed)

 * Hercules 2 has unused graphics.
 * Smart Mouse has an unused title screen.
 * Sonic Jam 6 - the title theme is longer than heard in-game.
 * Spiritual Warfare "QUACK! super secret bonus room" text inside.
 * Street Fighter II': Turbo (Genesis) seems to be a title hack (by pirates) of an early scrapped version of the Special Champion Edition. It features quite a lot of differences, including music and sounds.
 * Top Fighter 2000 MK VIII has unused stages (proof: )

Game Gear

 * Batman Forever has a hidden level select.
 * Lunar: Samposuru Gakuen has a debug mode.
 * Sonic Labyrinth has some unused graphics.
 * CutThroat Island has a prototype with a cheat mode.
 * Puyo Puyo changes to Puzlow Kids when inserted into an American system.

Pico

 * Game wo Shinagara Oboe You! Kantan Wakuwaku Keyboard (todo: verify name?) has a keyboard test, but A) is it already documented in the official documentation and B) nothing emulates the Pico Keyboard, so it's useless right now.
 * Tails and the Music Maker has some unused graphics.

Saturn

 * The Sega Saturn BIOS has revisional differences.
 * Spot Goes to Hollywood has a level select.
 * Dragon Force, Battle Arena Toshinden URA, and D-Xhird have debug modes that can be accessed without Action Replay codes. The D-Xhird debug code is accessed via a D-Pad input during the Takara logo, but what is it?
 * Andretti Racing has a rather fantastic hidden menu that allows you to adjust your fuel amount, number of laps, enemy AI and even the centrifugal force to make slipstreaming easier or trigger incredible crashes where your car flips as if there is no gravity!
 * NASCAR '96 has a debug menu that lets you alter many aspects of the game and play in Wireframe mode.
 * Wipeout 2023 (aka Wipeout 2) also has a debug mode which lets you play in Wireframe mode, as well as many other cool alterations.
 * Super Tempo has text relating to a debug mode, but methods to access said menu haven't been looked for yet/found.

Dreamcast

 * Half-Life has an unused intro.
 * Rez has a K-Project prototype.
 * Shenmue has debug rooms and a 0.400 prototype.
 * Sonic Adventure and Sonic Adventure 2 both have several prototypes out there.
 * Space Channel 5: Part 2 has an apparently unused animation of Blank from the first game. Confirm?

PlayStation
TombRaider Lead Coding. Paul Douglas Additional Coding. Gavin Rummery,Jason Gosling Additional PSX Coding. Del Leigh-Gilchrist, Dude Howe Lead Artist/Animator. Toby Gard Artists. Neal Boyd, Heather Gibson .....Email the Creators.... paul@nlights.demon.co.uk del@nlights.demon.co.uk ataru@dial.pipex.com www: http://www.nlights.demon.co.uk  Dude greets: Shroomz, Bag, The Menzie, Nagra, K-Comm, Snake & McBain of EZ-o-Ray... Mail me at ataru@dial.pipex.com
 * Ape Escape has a prototype distributed through PlayStation Underground, PSM, and other things with several differences, including an entirely different stage select.
 * Bounty Arms is an unreleased action game whose demo apparently includes screens and graphics never seen otherwise.
 * Bust a Groove has plenty of regional differences, such as removing cigarettes and changing a character who originally had a blackface/ganguro design.
 * Bust a Groove 2 also has plenty of regional differences, such as endings only in the Japanese version (which are all in English, with Japanese subtitles).
 * Chocobo Racing has at least one world changed.
 * Crash Bandicoot has unused "Time Crate" graphics found in VRAM.
 * Crash Bandicoot 2: Cortex Strikes Back has a prototype, as well as some regional differences just like the rest of the series.
 * Crash Bandicoot 3: Warped has a demo of a later (but not final) build, and regional differences.
 * Crash Bash Has a few demo disks floating about, not to mention a cheat code in said demo disks that allows access to the full beta with Homer and Bart Simpson as placeholder mugshots.
 * Crash Team Racing has a review copy containing several differences.
 * Croc: Legend of the Gobbos has both a tech demo and a prototype floating around.
 * Gex 3: Deep Cover Gecko has a prototype version with many differences on several Eidos demo discs - Volumes 4 (SLUS-90051), 5 (SLUS-90065), and 6 (SLUS-90074).
 * Granmaster Saga has a debug menu hidden in the US and Japanese versions.
 * Incredible Crisis has unused minigames and probably more unused content.
 * Rayman has some unused graphics and stuff.
 * Silent Hill - yes, I know there's a page on it, and I know what I said at the top. There's a whole lot of stuff buried on the disc, though...some found, some not.
 * There are some demo discs floating around that have different layouts for some things.
 * Some unused areas on at least the Midwich School map, and probably others knowing this game. Some of them are documented in a YouTube video (named "midwich.wmv", I think? It's really badly done though). It would be nice to have 3D models of these areas ripped, since it'd be clearer than in-game.
 * Spot Goes to Hollywood has a level select.
 * Spyro the Dragon apparently has some unused music tracks. There also exists a prototype with extensive differences from the original as well as a beta script, but only one person is in possession of it and refuses to leak it online. He has, however, documented the differences rather extensively in a playthrough of the build. There is also a text file filled with poetry from literary greats such as Shakespeare, not to mention being voiced by a female with extra dialogue for charging and gliding in the Japanese version.
 * Spyro 2: Ripto's Rage has poetry in text like Spyro 1 and 3. It also features an unused music track which may or may not be exclusive to EU versions, limited developer instructions (complete with very out of place profanity), an unused guidebook logo for Dragon Shores as well as dialogue and guidebook data corresponding to an unused orb mission in Shady Oasis (a harder variant of the "save the hippo's siblings" orb with 15 instead of 8)
 * Street Fighter EX 2 Plus supposedly has unused/unfinished modes, including Survival. The late Kao Megura has codes to access them in his guide on GameFAQs.
 * Tekken features an unused 3-frame memory card icon, portraying a crudely drawn Kazuya head. Some of the graphics in the Galaga minigame may also be loaded but not actually used.
 * Tekken 2 contains leftover hit effects from the arcade release (a green splodge), as well as an unused title screen background presumably used at promotional events prior to the game's arcade release.
 * Tomb Raider printf's this on startup. The site is in the wayback machine
 * Tomb Raider II has the following message in the exe, unreferenced. Dude is Dude Howe from the first game, aka Andrew Howe. There's also an earlier build ID'd as 'Release Version 1.1' from September 1997. It purportedly has all the levels, but the US final has a 'playable.psx' level file that it doesn't have.
 * Tony Hawk's Pro Skater has a prototype version floating around the net with quite a few differences to the final

PlayStation 2

 * Pretty much every NIS game ever:
 * Soul Nomad and its debug modes.
 * Disgaea: Hour of Darkness has a page, but it's missing a ton of content.
 * Disgaea 2 and its debug modes (it has some, right?). Also, the unused item "Hyperdrive" from La Pucelle and Disgaea 1.
 * Probably other games like Phantom Brave, La Pucelle: Tactics, and god knows what else.
 * Bloody Roar 4 contains the entire Renderware SDK!
 * Bully has one character that was probably cut early in development, as only an untextured model called TO_Gas_SA exists in world.img.
 * Crash Nitro Kart has alternate player icons in other regions.
 * Crash Twinsanity - this was created by someone with these helpful links.
 * Dark Cloud has a dummied Shell Ring, and others and it includes a Debug Menu for Dungeons.
 * Dark Cloud 2 has a debug mode. More info on the game's talk page.
 * Dragonball Z: Budokai features unused audio clips intended for the World Tournament mode which imply 3 extra characters were planned. There are also rather significant differences between US and European versions of the game, the latter lacking a dub track and featuring a totally different (and unintentionally hilarious), far more literal translation from Japanese.
 * Dragonball Z: Budokai 2 contains a few regional differences, particularly an extra Dragon World stage and an extra costume for Frieza referencing Neko Majin Z in Japanese versions.
 * Dragonball Z: Budokai 3 has an INSANE amount of unused audio, hundreds if not thousands of voice clips being scrapped, but left on the disc! Most pertain to Dragon Universe, in which every character was intended to have their own story, but there are a few other cases, including 5 unused character announcements in the World Tournament mode, an unused piece of music intended for Dragon Universe, a full set of Japanese Goku voice clips, a (presumed) test voice and more to come!
 * Final Fantasy X
 * Debug menu.
 * Unused Buster Sword item from Final Fantasy VII.
 * Harry Potter and the Prisoner of Azkaban has a debug mode and an unused level.
 * King of Fighters: Maximum Impact has a fun stash of unused voice clips, such as Yuki and...ANDY BOGARD!?
 * Kingdom Hearts has removed content from all games.
 * Metal Gear Solid 2: Sons of Liberty has a demo/trial edition that came with ZOE, with a cheat cart you can use the FAMAS that was shown in early videos/screenshots but ended up being cut from the final version and more
 * Metal Gear Solid 3: Snake Eater has some unused sound files for the early version of the torture scene.
 * and a dev menu. Instructions (and pre-made save files) can be found here
 * Oni has lots of removed content. Sadly I can't find the page which would show some of it. Also the images from the loading screen hint at a completely different plot.
 * Prince of Persia: Sands of Time has debugging text located in DATA\PRINCE.BF but currently cannot be decompressed. Check if it's in th ePC version which can be decompressed.
 * Ratchet & Clank has a lot of changes between the demo and final, and there is a vessel in the final (on the Drek's Fleet level) which can only be entered with cheats. Probably worth noting is the enemy behavior (especially the Blarg Space Commandos from Orxon) from areas of the Clank-playable sections which cannot be visited normally.
 * Ratchet & Clank 2 has a suspicious-looking island on Planet Dobbo that was possibly an early ship-landing area.
 * Ratchet: Deadlocked (aka Ratchet: Gladiator in Europe) has some unused audio files plus a prototype.
 * (andlabs TODO) Sega Ages 2500 Tetris Collection appears to have a System 16 version of Bloxeed that we otherwise don't know about (it was released on System 18 in Japan and System C internationally)
 * It also has leftovers from Space Harrier II: Space Harrier Complete Collection?
 * Fantasy Zone Complete Collection has a crapton of leftovers from previous entries (Monster World Complete Collection, Tetris Collection, Gunstar Heroes Treasure Box, Phantasy Star Complete Collection, etc.)
 * Related to (diff | hist) . . ! Sega Ages 2500 Series Vol. 33: Fantasy Zone Complete Collection‎; 16:31 . . (+1,406) . . BSonirachi (Talk | contribs | block)‎ (Added info about the unlockable Sega Sound Treasurebox.) [rollback]?
 * Phantasy Star Complete Collection has two versions of the Nei text adventure: ps2tnei.bin and ps2tnei_fixed.bin. The fixed one is the one that matches what's in Genesis ROM sets, and the executable makes no mention of ps2tnei.bin but it does mention the fixed one...and the two ROMs look to be very different with a 1:1 comparison (will need to do a diff-like comparison)
 * Shadow of the Colossus has unused scenes and cut content. Sample video.
 * Sly 2: Band of Thieves has a demo version that has its differences, as well as an unused health bar graphic.
 * Tales of Destiny has Blue Earth and Swordian voices for all attacks. and many more unused sound files. Also, Tales of Rebirth and Tales of Destiny 2.
 * TimeSplitters 2 has multiple demos . There's some info on the game's notes page.
 * True Crime: Streets of New York City has a easily accessible (via button combo) debug menu that has all sorts of switches and options to document.
 * WWE SmackDown! vs. Raw 2006 has a partially-deleted wrestler that uses the British Bulldog model but a unique entrance/moveset that looks like Maven's. Also, unused announcements for Maven and other wrestlers.

PlayStation 3

 * Quite a few PS3 games have debug menus that can be activated by running a PS3 CFW in "DEX mode" or using a debug CFW as can be seen in this post.
 * Some of the BlazBlue series needs work. BlazBlue: Calamity Trigger and BlazBlue: Continuum Shift feature a plethora of unused in-fight dialogue which can be heard in each game's respective Gallery mode, corresponding to scrapped move concepts, scrapped character interactions (such as Tager apologizing to Kokonoe and going "his own way") and numerous more. This is just what's been found on disc without hacking, there is very likely to be much more within the files.
 * Gran Turismo 5 has unused cars and parts, which later were completely removed due to abuse, plus a debug menu (the debug menu is in Gran Turismo 5 Prologue too).
 * LittleBigPlanet has a lot of unused sound effects.
 * PlayStation All-Stars: Battle Royale featured a rather intriguing development history, and the developers claimed Abe and Dart were intended to be playable but forcefully cut. There may be leftover data pertaining to these facts on-disc.
 * Resident Evil: Operation Raccoon City has unused Star Wars textures.
 * Tales of Graces f (also the Wii version) has an obscenely-high amount of voice clips, including a few for unused Artes.
 * Tales of Xillia - see above, and here.

Neo Geo

 * Plenty of debug modes to document here.
 * andlabs' to-do list:
 * General TODO: look for any Neo Geo games that have a custom eye catcher but don't use it

Neo Geo Pocket

 * Dokodemo Majong has a hidden developer credit.

Adobe Flash

 * Bionicle Mistika has a debug mode accessible with the cheat code "4T2".
 * Collapse! has some unused graphics.
 * Kantai Collection has an easter egg.
 * LEGO Castle has code which references a debug mode which is activated by pressing the 4 and 2 keys at the same time. It should activate the 1, - and = keys, but I couldn't get it to work
 * LEGO Mars Mission: Crystalien Conflict has some debugging cheats.
 * Transformice has some unused shaman items.

Arcade
NORMAL OJAMA TETRIS TETRIS TIME NORMAL ITEM USE OJAMA ALSO BROUGHT TO YOU BY: MAMIE VAN DOREN, TWIGGIE, THE EL PASO PHILHARMONIC, MOTHER, Generic TV DINNERS, YOUR LOCAL CHEVROLET BOTTLER, GARRY TRUDEAU, BERKE BREATHED, FRESH SNOW IN THE SIERRA NEVADAS, BUT MOST IMPORTANT, MY COFFEE MAKER!
 * Congo Bongo and Zaxxon, much like Donkey Kong, both have unused Ikegami Tsushinki logos.
 * Dangun Feveron supposedly has several unused music tracks.
 * DoDonPachi There is a 'winners don't use drugs' screen, an image that supposedly looks like this but lacked a proper palette and one unused music.
 * Dragon's Lair has unused animations and a prototype.
 * Gradius has one unused song, and Gradius III has three unused songs (Gradius I level start, Gradius II high-speed level, and a fanfare).
 * Gokuyou Parodius has unused music in the MAME ROM.
 * In fact, all the Parodius ports are usually different from each other. Parodius Da!: Shinwa Kara o Owarai e has the most noticeable of cuts, with two whole levels disappearing in various ports. I can't remember which game, but Konami chose to change the BGM of a level from "That's The Way I Like It" to avoid copyright.
 * The music change was in Jikkyou Oshaberi Parodius. It was left intact in the console versions but changed in the PSP version to "Brilliant 2U" from DDR.
 * Ketsui: Kizuna Jigoku Tachi has a few unused announcer voices - 'Just a couple more shots!', 'Please continue!', 'Game Over.'.
 * Marvel Super Heroes vs. Street Fighter has more unused graphics and voice clips.
 * Marvel vs. Capcom has some graphics and voice clips.
 * The Metal Slug series - so much stuff here.
 * Someone figure out how the Mortal Kombat games compress their graphics so we can sift through them? Please?
 * The Punisher has unused graphics and an unused bonus stage.
 * Samurai Shodown V has extensive regional changes - from cutscenes to proper endings.
 * Street Fighter III: New Generation has unused voice clips.
 * Street Fighter III: 2nd Impact also has unused voice clips.
 * Street Fighter III: 3rd Strike also has lots of unused voice clips.
 * Tapper has revisional differences.
 * Time Crisis has an unused song?
 * Time Pilot has revisional differences.
 * andlabs' list:
 * Borench contains leftover copyright text from Bloxeed; need to see if it contains the full code for the screen
 * Space Harrier also has the bin-chan used too many colors error
 * Dynamite Dux might have a different one: "OBJECT COLOR BANK OVER"? "OBJECT COLOR ENTRY OVER"?
 * Wrestle War has an anti-piracy message in plaintext which is probably used but ("COPIED AND SOLD WITHOUT"...)
 * Dynamite Dux (again): "SELECT COURSE BY LEVER"?
 * Viewpoint has lots of debugging stuff? "H-POS %04x Z %04x" "V-POS %04x  X %04x" "WALL-L %04x R %04x" "SHILD   %02d" "KEY RECORD FULL"?
 * Racing Hero (same programmers) too; also AB Cop?
 * Thunder Force AC: Is SELECT BY JOY STICK PUSH ANY BUTTON TO RECORD TIME part of the name entry?
 * Crack Down has a sound driver test? "Sound Note Oct Level 0123456789ABCDEF"
 * Shadow Dancer has a round select? "SELECT THE SCENE"/"ROUND   STAGE"/"COUNT UP DOWN BY SHOT JUMP BUTTON"/"START BY MAGIC BUTTON"
 * The Irritating Maze: "You are died ! Time Up !!  " ?
 * "IDAXAN"? (multiple) This is probably just an opcode but who knows
 * " DENGEKI  IRA-IRA BOU"... isn't it Denryu Ira-Ira Bou
 * OH BUT THERE ARE SOUND TEST STRINGS! Since the game never had a home port and the MVS service mode doesn't have a sound test...
 * "COMING SOON"? (multiple)
 * "SILENT@MODE"? "POSITION CHECK ROUTIN"? repeated Stage Select/Course Select strings for when starting a game?
 * System 18 Bloxeed: "SEGA PRESENTS"/"SPECIAL THANKS TO GOD"/"AND EVERYONE ELSE !!"? (consecutive in ROM) "GOOD"/"DESUNE!"/"BONUS"? (together, but not immediately consecutive)
 * After Burner II:
 * The hidden messages (different ones) are there, and people have gotten them to show up, but we don't have a definite clue as to how written down
 * Is there a way to play versions of the music with melodies? Some of the home ports have melodies added to Final Take Off (Commodore 64, PC Engine, etc.) but here's a version of the arcade song with a melody that sounds very FM-y?
 * Tetris (Sega) and Flash Point - "OVERFLOW" in the RAM/ROM checks?
 * Flash Point:
 * Namco System 2 games (search for Now Production continues):
 * Assault uses " RIDDLE OF RUBY " as a startup check string... is this significant in any way? there is no game by that title...
 * Cameltry: investigate word flag at beginning
 * Hebereke no Popoon: "END_OF_DATA_SECTION." and strings related to cutscenes and character names? and then "      CHR TEST" near the beginning of the ROM where there is a copy of the test mode strings?
 * Peter Pack-Rat: in ROMs 146 and 147 (interleaved bytes), stored with the credits:
 * used?

BBS Door

 * Legend of the Red Dragon has cheat codes and a hidden poem.

ColecoVision

 * Frenzy has a hidden message.

Game.com

 * Batman & Robin has a sound test.
 * Mortal Kombat has a secret menu and characters.

Handheld LCD

 * According to the TVTropes page, there's some Dummied Out Tamagotchis on the Tamagotchi ROMs. Look into that, and also document the debug menus on some of the Tamagotchis.
 * TamaTown Tama-Go has unused graphics from a factory test program.

HTML5

 * Angry Birds Telepizza has large amounts of Angry Birds Chrome leftovers.

J2ME

 * Sonic the Hedgehog 2 Dash has unused graphics.
 * Sonic the Hedgehog Golf: The 240x320 version has a folder called Debug in the Coral folder. Is there a debug mode in this game?
 * Sonic Spinball: The 240x320 version has all of the graphics from Fight Night Round 4.
 * Sonic Unleashed has differences between the regular version and the touch screen version.

Magnavox Odyssey2

 * Killer Bees! has the initials of the developers.
 * Turtles! has a developer message.

NCR Decision-V

 * Ladder has unused text.

Nokia N-Gage

 * Pandemonium has a cheat mode.

Nuon

 * FreeFall 3050 A.D. has a cheat menu.

Panasonic JR-200U

 * Cosmic Patrol has unused text and hidden devcredits.
 * Crazy Mazey has hidden devcredits and a build date.
 * Galactic Chase has unused text and hidden devcredits.
 * Mars Cars has hidden devcredits and a build date.
 * Mischievous Mansion has unused text.
 * Solitaire has hidden devcredits and a build date.
 * Trapit has unused text.
 * Vortex has hidden devcredits and a build date.

Philips CD-i

 * The CD-i BIOS has text related to debugging tests and revisional differences.
 * The 7th Guest has a room select.
 * Atlantis has a cheat mode.
 * Lucky Luke also has a cheat mode.

Plug & Play

 * There are more JAKKS Pacific games with debug modes (some are mentioned here).
 * Atari Flashback 2 has a few hidden menus, a prototype, and regional differences.
 * Ms. Pac-Man, Pac-Man, Pac-Man Arcade Gold, Retro Arcade Featuring Pac-Man, Super Pac-Man, and Wireless Ms. Pac-Man all have debug modes. No, seriously. Some of these have leftover sounds from a scrapped Jr. Pac-Man game, according to this site.

Sharp X68000
Binary file ./NOP/D-Return/D_RET31.MDX matches Binary file ./NOP/D-Return/D_RET35.MDX matches Binary file ./NOP/D-Return/D_RET36.MDX matches Binary file ./NOP/D-Return/D_RET37.MDX matches Binary file ./NOP/D-Return/D_RET38.MDX matches Binary file ./NOP/D-Return/D_RET34.MDX matches Binary file ./NOP/D-Return/D_RET33.MDX matches Binary file ./NOP/D-Return/D_RET32.MDX matches Binary file ./Zoom/Genocide 2/GENO2_29.MDX matches Binary file ./Zoom/Genocide 2/GENO2_25.MDX matches Binary file ./Zoom/Genocide 2/GENO2_28.MDX matches Binary file ./Zoom/Genocide 2/GENO2_27.MDX matches Binary file ./Zoom/Genocide 2/GENO2_24.MDX matches Binary file ./Zoom/Genocide 2/GENO2_31.MDX matches Binary file ./Zoom/Genocide 2/GENO2_30.MDX matches Binary file ./Zoom/Genocide 2/GENO2_26.MDX matches Binary file ./Zoom/Genocide 2/GENO2_23.MDX matches
 * Gradius has a sound test.
 * Lots of Easter eggs in a lot of games (mostly developer messages, images and sound test). How to access them can be found in Japanese cheat pages here.
 * Metal Sight apparently has an unused song; or at least that's what the description of MDX/System Sacom/Metal Sight/METAL02.MDX in mdxo_mxdrv_complete.ra_ seems to imply. The file doesn't work with either mxdrv or mdxplay... (TODO try the Windows-based players)
 * D-Return - the following in mdxo_mxdrv_complete.ra_ are marked unused:
 * Genocide 2 - mdxo_mxdrv_complete.ra_ marks the following as unused:

TurboGrafx-16

 * Blazing Lazers and Devil Crush - is sound 40 ever used?
 * Alien Crush, Cyber Dodge, Cyber Knight, Xevious: Fardraut Densetsu - do they have this sound?
 * Lady Sword - hidden developer diary in the script - translation in the readme for the translation hack.

Vii

 * 10-in-1 has some unused text. Check to make sure that it wasn't added in by whoever dumped the ROM.

Watara Supervision

 * Most Thin Chen Enterprises games have unused content, including:
 * Balloon Fight has the file names/paths of various source code files.
 * Magincross has lots of text from a development tool.
 * Galaxy Fighter, Pyramid and Tasac 2010 all have source code leftovers.
 * Tasac 2010 and Super Kong also have bits of DOS directory listings.

WonderSwan Color

 * Final Fantasy has an unused naked bald guy in with the class select sprites, hinting at a possible use for that dude stored with the orb graphics in the original game.
 * Final Fantasy IV is where the enhanced variants of the unused graphics in Final Fantasy IV Advance originally came from. It might be worth looking into whether the debug features in that port originated in this version, since they only cover the original game.

ZX Spectrum

 * Manic Miner has a cheat mode accessible by typing.

Multiplatform Games

 * Battlefield 4 probably has some beta content that might be worth poking around in. Also, don't forget the "Alpha" and "Beta" Prototypes for it. Revisional Differences aplenty.
 * Bayonetta has quite a few things:
 * An unused animation lying somewhere on the disc for the Shuraba weapon. Hideki Kamiya, director of the game, says that said animation has the sword's hilt open when the weapon is fully charged, making the pulsating heart inside it fully visible.
 * Several duplicate and placeholder models, as well as some test shapes.
 * Fake credits courtesy of "Lumen Sage Productions" that are not used anywhere in the game.
 * Test audio files that consist entirely of Japanese speech, probably recorded by one of the Platinum Games employees.
 * Lollipop Chainsaw may have more unused/leftover voice clips or sound clips in its files. Also, this official artwork used on the Japanese website (and some Japanese promotional material as well) depicts various zombie types encountered throughout the game, all of which are seen in the final...except for the two in the very back who have afros. Do they by any chance have any data files floating around?
 * Medal of Honor: Frontline and Medal of Honor: Rising Sun have "tons of unused models in the game's folder. Most of the models are in .bsp extension"
 * Rayman Origins is said to have unused dialogue existing within the files. This dialogue gave the game more of a plot, but the developers cut it for unknown reasons. There is also a really epic rock tune floating somewhere on the disc that was meant to play in a scrapped boss battle where the Magician revealed himself to be Mr. Dark's apprentice. (Mr. Dark was the villain of the very first Rayman game, which Origins is a prequel to. Also, the real encounter with the Magician in the final has the player merely chase him down.)
 * Soldiers of Fortune II: Double Helix was altered in the German version to make all the humans robots.
 * Sonic & All-Stars Racing Transformed is said to have incomplete character data for Billy Hatcher. He was meant to be playable, which explains why he does not appear with his friends at Chilly Castle and why he doesn't appear as a hologram at Race of AGES, but his data was never completed because the devs couldn't come up with a good vehicle design for him.
 * The console and Vita versions also have incomplete, unused data of the PC-exclusive characters.
 * Super Smash Bros. (Wii U, Nintendo 3DS) features a brand-new look for the Bumper, with a very detailed backside...which players will never be able to see in-game. (Screenshots available on Miiverse and possibly the SSB website)
 * Doctor Who has lots of games officially licensed by the BBC (as well as unlicensed games) there has got to be some unused stuff here.
 * Flappy Bird is a famous repetitive mobile game that was "mysteriously" removed from app stores, must be worth checking? There is an iOS version and an Android version and there are two revisions from the original version, the others are clones by different developers.