The Cutting Room Floor:Games with Overdump Data or Leftovers

(Note: This page was created to consolidate pages on TCRF which make mentions of games having overdumps in them. Also serves as a useful reference to check the status of known discoveries. Content here was originally derived from findings shared by our friends at Hidden Palace.)

Overdump is the community nomenclature used to describe a game containing partial data from another game. There are several ways this can happen, and usually occurs unbeknownst to a busy developer. The word "overdump" alone technically doesn't make sense, as that term actually refers to garbage/random data resulting from reading outside the capacity of the ROM chip itself, so this phenomenon is sometimes also referred to as leftover data or slack data.

For some cartridge-based systems, overdumps occur in development carts when they are reused and flashed with a build of another game of a smaller size. If a development cartridge is flashed with a 32MB build of a game, then later is flashed with a 16MB build of a game, the remaining and unwritten 16MB from the previous game would be considered the overdump. Some older systems have this leftover data as a result of data buffers. If data was written to a cartridge in chunks at specific addresses, and other addresses weren't overwritten, leftover data could occur as a result. Digital or disc-based games generally have leftover data from reused project repositories.

We may not always know why leftover data exists or how it got there, but it is there, waiting for us to find it.

Nintendo Consoles

Game Boy

Game	Overdump Data	Starting offset(s)	Has diffs from final?	Notes
Splitz (Altered build)	Populous	Todo	?	64 kb leftover.

Game Boy Advance

Game	Overdump Data	Starting offset(s)	Has diffs from final?	Notes
I-Ninja	Metal Slug Advance	0x440000	Yes	Spotted by Lunar. Missing Nintendo licensing info.
Sega Rally Championship (Prototype)	Sonic Advance 2	Todo	?	Contains half of an unknown build.
Wolfenstein 3D	Ecks vs. Sever	0x500000 - End	No	Specifically a scene release, for whatever reason (the group's intro is at 0x7FFD66).

Nintendo 64

Game	Overdump Data	Starting offset(s)	Has diffs from final?	Notes
Controller Pak Test Program v5.4 (Prototype)	WWF Attitude	Todo	?
Proto:Blues Brothers 2000 (Prototype #20)	Roadsters	0x1000000	No	Matches USA final.
Blues Brothers 2000 (Prototype #53)	Roadsters	0x1000000	No	Matches USA final.
Controller Kensa-ki NUS-yo N Cassette	Unknown game or demo	0x2000000	?
F-Zero X (development cart)	The Legend of Zelda: Ocarina of Time	0x1000000	Yes	Contains many assets from what appears to be the SpaceWorld '97 demo.
Hercules: The Legendary Journeys (Prototype)	Ridge Racer 64	0x10E0000	No	Final PAL build.
Proto:Mario Party 3	Conker's Bad Fur Day	0x2000000	No	Matches the October 25, 2000 build.
Rugrats - Scavengers (Prototype)	Scooby-Doo! Classic Creep Caper	0xE00000	No	Matches USA final.
Taz Express	Daffy Duck Starring as Duck Dodgers, PGA European Tour	0xC00000, 0x1000000	?	Uncommon scenario having multiple overdumps.
Tommy Thunder (Prototype)	Robotron 64	0x42A650	No	Matches USA final.
Tony Hawk’s Pro Skater 2 (v012) (2001-06-04)	Spider-Man	0x1000000	No	Matches final.
The Legend of Zelda: Ocarina of Time (PAL) (GCN) (Feb 21, 2003 Debug Prototype)	Conker's Bad Fur Day	0x03900000	No	Matches the October 25, 2000 build.
Proto:The Legend of Zelda: Majora's Mask/Debug Version	The Legend of Zelda: Ocarina of Time	0x02100000	Yes	Likely a European localization prototype. Contains fully decompressed assets. Very similar to the builds that are currently dumped (especially the PAL GCN February 13, 2003 prototype, which also contains fully decompressed assets).
THQ-Eurocom N64 Test Cartridge (prototype)	Duke Nukem: Zero Hour	0x800000	Yes	Significant differences from final. Early textures.
WipEout 64 (Prototype)	Chameleon Twist	0x800000	Yes	Prototype build.

Nintendo 64DD

Game	Overdump Data	Starting offset(s)	Has diffs from final?	Notes
Super Mario 64 (Nintendo 64DD)	Previous writes of Super Mario 64	0x15AB90, 0x166010, probably more	?	Technically an underdump (previously-written data that begins before current build on disk). Several duplicate compressed MIO0 blocks, seems to match final. Second MIO0 block is partially overwritten.

Nintendo DS

Game	Overdump Data	Starting offset(s)	Has diffs from final?	Notes
Robogear 3D Tactics (prototype)	Pirates of the Caribbean: At World's End	Todo	?	Likely has overdump of another game after Pirates that needs to be identified. Second overdump spotted by IMN.

Satellaview

Game	Overdump Data	Starting offset(s)	Has diffs from final?	Notes
Do-Re-Mi de Faa~! Vol. X - 3-30 Gou (magazine)	BS Zelda no Densetsu: Inishie no Sekiban	0x80000-0xB0C00, 0xD7E10, 0xE0000, and more	Yes	0x80000-0xB0C00 matches Zelda, but there are differences in areas after. Possible prototype?

SNES/Super Famicom

Game	Overdump Data	Starting offset(s)	Has diffs from final?	Notes
Al Unser Jr's Road to the Top	F-Zero	0x1FE40-0x20000	No	Matches final.
Aladdin (Europe)	Mega Man X	0x76800	No	Matches final.
Aladdin (Japan)	Super Formation Soccer II	0x75BA0	No	Matches final.
Araiguma Rascal	The Legend of Zelda: A Link to the Past	0x60000, possibly more	No	Matches final.
Batman	Ken Griffey Jr. Presents Major League Baseball	Various	No	Matches Rev0 final.
Battle Blaze (Beta 1)	Otogirisou	0xF9EE0, possibly more	No	Matches final.
Battle Blaze (Beta 2)	F-Zero	0xF9EE0, possibly more	No	Matches final.
Card Master: Rimusaria no Fuuin	The Legend of Zelda: A Link to the Past	0x20000, 0x30000, 0x40000, 0x80000, likely more	No	Matches final.
Chester Cheetah: Wild Wild Quest (Beta)	Super Naxat Open - Golf de Shoubu da Dorabocchan	0x7A2C0	No	Matches final.
Donkey Kong Country (Europe)	Super Metroid	0x25F240-0x260000, likely more	No	First block matches final at 0x12F240-0x130000.
Havoc (USA) (Demo)	Super Mario World	0x3F000 - End	No	Matches final.
Itadaki Street 2: Neon Sign wa Bara Iro ni	Sound Factory (proto)	0x128AC0-0x129696, 0x148920, 0x13A500, likely more	?	First block has diffs at 0x810E4-0x81C80 in Sound Factory. Next two match final.
Ninjawarriors Again	Super Mario All-Stars	0x1CEB0-0x20000	No	Matches Japanese final.
Reactor (Europe) (Proto)	F-Zero	0x44700-0x554E0	Yes	Likely a late prototype of F-Zero. Differences from final.
The Rocketeer	F-Zero	0x1FDD0-0x20000	No	Matches final.
Shin Megami Tensei if...	Derby Jockey: Kishu Ou e no Michi	0xFBC70, possibly more	No	Matches final in Derby Jockey at 0xFBC70.
Shin Megami Tensei if... (Rev1)	Kirby Bowl (Japan)	0xFBC70, 0x11D290, 0x11D0E0, likely more	Yes	First two chunks match final, but a few byte diffs around 0x11D0E0.
Shin Megami Tensei II (Rev 1)	Ganbare Goemon: Yuki Hime Kyuushutsu Emaki	0x6FC90, possibly more	No	Matches final.
Proto:Super Donkey	The Legend of Zelda: A Link to the Past	0x98000	Yes	Contains significant portion of data from an early build.
Super Donkey	The Legend of Zelda: A Link to the Past	0x98000	?	Either predates or matches Japanese final.
Super Donkey Kong	Super Metroid	0x28E5B0, possibly more	No	Matches final.
Sword Maniac (Japan)	Super Mario World	0x1A580-0x1C000, 0x1CC00-0x1D000, likely more	No	Matches final.
Proto:Super Mario World	The Legend of Zelda: A Link to the Past	0x28E5B0, 0x34970, 0x3A180, 0x6F090, and more	Yes	Significantly early Zelda build. 0x34970 matches some data in Super Donkey at 0x35720. 0x3A180 has some matches to Super Donkey around 0x3B6C0. 0x6F090 has dungeon overlay and data pointers.
Teenage Mutant Ninja Turtles: Tournament Fighters (prototype)	Super Mario World	0x3165C, 0x3F74B, 0x4E366, 0x4F477, many more	No	All data chunks from World are likely final.
Wing Commander - The Secret Missons (Europe) (Beta)	Super Mario World	0x5FBA0, likely more	No	Matches final.
X Zone (Europe)	The Legend of Zelda: A Link to the Past	0x20000, 0x30000, 0x50000, 0x70000, likely more	No	Matches final.

Sega Consoles

32X

Game	Overdump Data	Starting offset(s)	Has diffs from final?	Notes
Proto:Knuckles' Chaotix/1207 Prototype	After Burner	0x3DC30-0x40000	No	Matches JP/US final.

Game Gear

Game	Overdump Data	Starting offset(s)	Has diffs from final?	Notes
Coca-Cola Kid	Sonic & Tails	0x7C000 - End	No	Matches final.
Frogger	Streets of Rage	Todo	?	Matches final?

Genesis/Mega Drive

Game	Overdump Data	Starting offset(s)	Has diffs from final?	Notes
Proto:Knuckles' Chaotix/Sonic Crackers	Teenage Mutant Ninja Turtles: Tournament Fighters	Todo	?	Art and audio samples.
Proto:Sonic the Hedgehog 2 (Genesis)/Nick Arcade Prototype	Sonic the Hedgehog, ToeJam & Earl	0xE0180, 0xE1670	No	Both overdump contents seem to match final.
Proto:Sonic the Hedgehog 2 (Genesis)/Simon Wai Prototype	Chiki Chiki Boys	0x24A30, 0x437BC, 0x46350, 0x48DB4	?	The locations of the data match the equivalent area in both versions of the Chiki Chiki ROM, but with some slight differences suggesting that the remnants here may be from a prototype.
Proto:Sonic the Hedgehog 3	Star Trek: The Next Generation: Echoes From the Past	0x04CC90, others	?	Various bits.
Proto:Yuu Yuu Hakusho: Makyou Toitsusen	Sonic Crackers, Space Harrier II, J.League Pro Striker 2, Streets of Rage 3	Todo (many)	Yes	Rare scenario of a prototype having leftovers from multiple games.