Sonic Adventure 2 (Dreamcast)

Sonic Adventure 2 is the sequel to Sonic Adventure. There are three types of levels: Sonic/Shadow levels with lots of speed, Tails/Eggman levels - shoot everything in sight, and Knuckles/Rouge levels, where you hunt three treasures. It was re-released for the GameCube as Sonic Adventure 2: Battle.

Unused Objects
There are some unused objects in some levels. Some have been jammed inside a wall or another inaccessible place. Others are still interactable, because instead of being deleted, they are simply invisible.

Hidden Dash Pad in Iron Gate
After the first locked door, there's a room with an elevator that leads to a tight tunnel, and after that you drop into a room. Before that room, to the right, there is a dash pad inside the wall.

Hidden Dash Pad in White Jungle
There is a dash pad under the middle of the long downwards path that starts the level.

Invisible Rail in Meteor Herd
Knuckles can't grind in this game, so that is why nobody stumbled upon this invisible rail. However, if one uses cheats to play as Sonic or Shadow on this level, they can use it. It start on the central tower, and ends near the starting point.

Hidden Spring in Final Chase
If Shadow turns around and grinds backwards on the starting rail, he will eventually encounter an off-screen spring that bounces him downwards to his doom.

Black Market
It appears that the black market from Sonic Adventure 2: Battle was originally intended for the Dreamcast version.



Playground
Files found in the game show that a playground was to be included in the Chao Garden.



Textures from this picture in-game show that this may have been intended to be a playable area.



In the PC version, geometry was discovered.



Library
There was, at one point, going to be a Library. It's texture's file name is AL_STG_KINDER_PL_TEX.PRS, which may mean that you were able to access it from the Kindergarden.







In the library, you would have been able to download or create new stories for Chao Adventure 2. While this was never fully implemented, Chao Adventure 2 still has the modular design needed to support multiple stories. The disc has one file (OSAMPO2S) representing a blank Chao Adventure 2 VMU program with no Chao or stories loaded, which is combined with the Chao data and story files. It's possible to run the blank program on a VMU without crashing, and it displays a message that no Chao is available. The disc has 10 story files, with two files for each language.


 * This is the library.
 * There are many kinds of books here.
 * Download a story for Chao
 * Adventure 2 that you've created.
 * Create a story for Chao Adventure 2
 * and upload it to the library.
 * Which story to download?
 * Download this story?
 * The story is saved to memory.
 * Would you like to upload this story?
 * Your story is saved in the library.
 * Download a story.
 * Upload a story.
 * Story editor information



World Ranking System
There are a few remnants of a World Ranking system in the game disc. It was in Sonic Adventure but it was left out of this game. The following text could be found in Advertise.prs. advsng_3.adx refers to the regular menu music which would have been used here also. 
 * worldRankingExec
 * advsng_3.adx
 * emblemResultExec
 * emblemResult
 * dialup_icon0
 * dl_event_batu
 * emblem256
 * emblem_moji0
 * emblem_sheet
 * emblem_stagename_add
 * emblem_title
 * emb_charawindow_all
 * stg_stagename
 * wrank_jyuni_window
 * wrank_penmaru
 * wrank_title
 * wr_flag
 * wr_moji0
 * wr_rankbtn_add
 * wr_rankbtn_e wr_rankbtn_j
 * wr_rankmode_e
 * wr_rankmode_e2
 * wr_rankmode_j
 * wr_rankmode_j2
 * wr_rankplate_big512
 * wr_suuji0
 * wr_windows
 * w_ranking_bg0
 * w_ranking_bg1
 * w_ranking_bg2
 * w_ranking_bg3
 * w_ranking_bg4
 * w_ranking_bg5
 * w_ranking_bg6
 * w_ranking_bg7
 * advsng_3.adx

 After further digging in the disc more text is revealed which would display onscreen. There was a login and registration (probably to reduce cheating). The rankings could have been searched by country and name. It referred to the world ranking system as "The Sonic Network." The text was translated into numerous languages such as French, German, Japanese, Spanish. 
 * Display or update world ranking
 * Press Y-button to update data.
 * Time Attack world ranking
 * Score Attack world ranking
 * Emblem world ranking
 * Total ranking
 * View stage world ranking
 * Edit your comments
 * Network registration is required
 * to enter world rankings.
 * Use latest browser to register
 * on the network.
 * Connecting to the Internet.
 * While connected to the network,
 * you will be charged a telephone
 * fee and ISP connection fee.
 * If you are using the ISAO Net
 * with a phone prefix number starting
 * with 0990, the telephone fee will be
 * 10 yen for 3 minutes in accordance
 * with the Dial Q2 system.


 * Please refer to manual
 * for more information.
 * Do you want to connect? 
 * Connecting to the Internet
 * While connected to the network,
 * you will be charged a telephone
 * fee and ISP connection fee.
 * Do you want to connect?
 * Dialing �–�–�–�|�–�–�–�|�–�–�–�– 
 * Enter "ISP" ID and password ID<++> Password<++>
 * Unable to find modem.
 * Check modem connection.
 * The line is busy.
 * Dialing next phone number.
 * Please try again later.
 * Check modem settings.
 * Unable to dial.
 * Check modular cable connection,
 * or modem settings.
 * Unable to connect. The line is busy.
 * Please check the modem settings
 * and try again later.
 * Unable to connect to server.
 * Server authentication failed.
 * Check ID and password.
 * Disconnected due to no activity.
 * While connected to the network, you will be charged a telephone
 * fee.
 * Do you want to connect?
 * Now connected to the Sonic Network.
 * The server is busy.
 * Please try connecting again later.
 * Updating the database.
 * This may take several minutes. 
 * Cancel data connection? 
 * Are you sure you want to disconnect?
 * Your rank has increased to
 * number <++> in total ranking.
 * Your rank has decreased to
 * number <++> in total ranking.
 * Your ranking has increased to
 * number <++> in <++> score attack.
 * Your ranking has increased to
 * number <++> in <++> time attack.
 * Your rank has increased to
 * number <++> in emblem ranking.
 * Your ranking has decreased to
 * number <++> in <++> score attack.
 * Your ranking has decreased to
 * number <++> in <++> time attack.
 * Your rank has decreased to
 * number <++> in emblem ranking. <++>
 * Use this E-mail address
 * for confirmation?
 * (You can set E-mail address
 * for receiving info later.)
 * No E-mail setting on Dreamcast.
 * Use latest browser to change
 * Email settings. Are you <++>?
 * Enter your password. <Cancel><Forgot password>
 * Your password is incorrect.
 * Enter password again. <Enter><Cancel><Forgot password>
 * Do you want to receive
 * your password via E-mail?
 * Mail was sent to
 * your E-mail address.
 * Please check your mail.
 * Welcome to the Sonic Network.
 * Enter your user name.
 * 12 characters maximum
 * length for user name. <Enter> <Cancel>
 * User name already exists.
 * Enter password if you
 * want to use this user name.
 * Next, enter password.
 * Passwords must be at least 5
 * characters, maximum is 12. <Enter><Back>
 * Set E-mail account.
 * If you forgot your password,
 * your password can be mailed to you. <Enter><Cancel>
 * Do you want to share your E-mail
 * address with other users?
 * If you don't, select "No".
 * Select country and area
 * where you live. Country:<++> Area:<++>
 * The Sonic Network is a public area to
 * exchange information with other users
 * around the world. Please try to
 * conduct yourself in a civil manner.
 * Warnings may be issued to users and
 * users may be ask not to use our
 * service, if activities violate the
 * rules of the Sonic Network.
 * <++>'s Registration complete.
 * Display ranking from the top.
 * List specified ranking.
 * Search ranking by user name.
 * List ranking by country or area.
 * Enter ranking you want to see.
 * Enter user name you want to search.
 * Enter country you want to list. Country<++> Area<++>
 * You can see user information.
 * Press B-button to go
 * back to list screen.

</tt> The images below display remnants of the world ranking system also:

Unused Audio Clips
A large number of unused audio clips remain in the game's data, primarily because of re-writes occurring after these voice clips were put into the game's data.

Omochao
Omochao has tons of unused dialogue, some of which hints toward all sorts of content related to the Chao Garden that was omitted from the final version.

Goal Quotes
While Sonic Adventure 2: Battle would place some Omochao near the goal rings, Sonic Adventure 2 does not have these Omochao. Thus, without hacking, it is impossible to hear these quotes at all.

Debug Menu
There is a debug menu in all versions of the game which is accessible by hacking.

In the Dreamcast version, you can replace ADVERTISE.PRS with TITLE.PRS.

In the GameCube version, you can replace advertiseD.rel with titleD.rel or use the NTSC-US Action Replay code 7V85-EB5E-T1K7W G1HQ-DBYC-PVZAY 3NV3-R6FU-ZPNDA In the PC version, you can use a memory editor to go to 434687 and change CC 76 8B 00 to 98 8F 8B 00. The code to display the menu items onscreen was removed in the PC version, but it still functions.

The menu has the following options to choose from: The GAME and DEMO options will ask you to choose a character or character set and a level. The list of levels includes all that character's normal stages, the test level (listed as BASIC TEST), Chao World (misspelled as CHAO WARLD) and occasionally SONIC TEST or KNUCKLES TEST, which do not exist in any released version of the game, and crash if you try to select them.
 * GAME:1P ONLY - Play a level with one player.
 * GAME:2P 3POINTS MATCH - Play a level with two players until one player wins three times.
 * GAME:2P 1POINT MATCH - Play a level with two players.
 * TEST:EVENT - View cutscenes.
 * DEMO:1P ONLY - Record a demo with one player. Press Start to end the recording.
 * DEMO:2P - Record a demo with two players. Press Start to end the recording.
 * DEMO:LOOK PREVIOUS TAKEN ONE - Replay the previously recorded demo.
 * PLAY:FROM HERO - Play the story mode on the Hero story.
 * PLAY:FROM DARK - Play the story mode on the Dark story.
 * PLAY:FROM LAST - Play the story mode on the Last story.

QKd5vVHuY5I The Event Test not only lists all the events and allows you to view them, you can also stop cutscenes with the B button, and speed them up or slow them down with the shoulder buttons, even making them run in reverse.

Unused Mission Text
Within the file containing the text for each level's missions, two stages have unused text. For level 0, the test level: For level 2, a level which does not exist in any released version of the game: These texts can be seen ingame via RAM editing in the PC version.
 * 1st Mission: Make sure we debug this!
 * 2nd Mission: Find 100 bugs!
 * 3rd Mission: Find bugs that you couldn't find!
 * 4th Mission: Debugged in 2 minutes!
 * Last Mission: Try bug 0!
 * 1st Mission: This stage is cool!

Super Sonic and Shadow in 2P Mode
Within the game's text, there are lines indicating that Super Sonic and Super Shadow were meant to be unlockable characters in the game's 2P Vs. mode. Congratulations! You've cleared Green Hill with Rank A. Strongest characters are now available to use in Sonic and Shadow 2P versus mode. In the final game, completing Green Hill with an A rank doesn't give you anything. SUPER SONIC Powered by the 7 Chaos Emeralds. Amazing speed and moves, but dies if rings are lost. SUPER SHADOW Powered by the 7 Chaos Emeralds. Amazing speed and moves, but dies if rings are lost. These lines are similar to the descriptions for the other characters in 2P mode.