Sonic Adventure 2/Hidden content

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Clean pause

In any mode, pause the game and hold + to clear the game of the pause menu.

Big the Cat

In certain cutscenes, Big the Cat is viewable via pressing buttons at a certain time. For example, in the Dreamcast version of the game, In the cutscene after fighting Knuckles/Rouge, press and again and again to make Big appear and walk around.

Big also makes an appearance hidden in each stage. In fact, his appearances were so obscure that the development team for Sonic Adventure 2: Battle seems to have forgotten to port him, with many of his former spots being occupied by placeholder objects (Pointing to Rings) using his object ID.

Unused content

Special Stage Art

These are various graphics that can be found inside the game's disc.

Artwork	Name	Description
	2p VS mode graphic	Unused 2PVS menu system texture.
	2p VS mode graphic	Unused 2PVS menu system texture.
	Text	These probably go over the top of the previous graphics to make the menu selection. It seems that ??? was used to cover the menu selection for "All" until it is unlocked. In the final game nothing is shown shown until it is unlocked.
	Mode Select Graphics	Leftover graphics from Sonic Adventure 2 (Preview).

Trial Version leftovers

Leftover menu elements and screens from Sonic Adventure 2: Trial Version.

2p VS Menu

Green Hill is listed among text for 2P vs. stages. In-game however, the list doesn't scroll down this far. If it's forced to do so, Green Hill can be selected and is fully functional as a 2 Player stage.

Early Menu 1

Early menu system in English and Japanese. Note how Playground and Library are listed, but were not a part of the final game. The Black market was also unused in this game, but were used in the updated GameCube port. A Black market was actually available in the Dreamcast version but was only accessable on a website.

Early Menu 3

These graphics were used for another menu system. Rather than drawing out the text the text would have been placed on top of these.

Lost Tutorial Screens

May have taught about Knuckles' special moves in multiplayer.
May have taught about Tails' special moves in multiplayer.
May have explained how to use the Mystic Melody.
Used to possibly explain about how to pick up objects.

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? <Yes><No> 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 �–�–�–�|�–�–�–�|�–�–�–�– <Cancel> 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> Cancel data connection? <Yes><No> 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. <Enter><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.

The images below display remnants of the world ranking system also:

Menu text
Character would be shown next to the ranking
Menu text
Menu text
World Ranking text which would be on every screen
Flags representing the country the ranking was obtained in
A message relay system, possibly e-mail or a message board
Giant emblem

Black Market

Menu
Black Market
Textures

The menu in the first picture indicates the presence of a Black Market. The second picture was actually from Sonic Adventure 2's website. The textures shown in the third picture were extracted from AL_STG_KINDER_BL_TEX.PRS on the game disc.

Playground

Playground
Textures
Fully textured render

The first picture shown can be found in-game and provides solid proof of a Chao Playground existing at some point. The second picture actually shows some textures which were extracted from AL_STG_KINDER_PL_TEX.PRS on the game disc.

Library

Fully textured render
Leftover model
Leftover model
Books
Textures

These images show an unused Library for the Chao Kindergarten. The models are found in CHAOSTGKINDER.PRS and the textures in AL_STG_LI_TEX.PRS.

Unused Themes

The following images show various themes which can be found on the disc, but are not usable.

Shadow Theme
Amy Theme
Chao Theme
Maria Theme
Secretary Theme

The nexus memory card save containing one theme can be downloaded below:

Level Maps

City Escape
Start: yellow block at top left
End: magenta block at bottom
Cosmic Wall
Start: yellow block at top left
End: dark red block at bottom
Crazy (Gadget)
Start: yellow block at bottom right
End: right side of the only dark blue block
Egg Weapon (Iron Gate)
Start: cyan block at bottom left
End: gray and dark magenta blocks at right
Eternal Engine
Start: yellow block at bottom
End: dark cyan block at top right
Final Chase
Start: yellow block at top left
End: top of gray block at left middle
Final Rush
Start: yellow block at top left
End: top of dark red block at left middle
Green Forest
Start: yellow block at top left
End: magenta block at bottom right
(Radical) Highway
Start: red block at bottom right
End: yellow block at top left
Lost (Colony)
Start: red block at bottom
End: yellow block at top right
Mission (Street)
not an accurate depiction of the level
Sky (Rail)
not an accurate depiction of the level
Tails Prison (Lane)
Start: rightmost outcropping of yellow block at right
End: magenta block at top left (the red block is the Laser Blaster room)
Water
Presumably a generic descriptor for the water surface in both Metal Harbor and Weapons Bed; it has no value as a map
White Jungle
Start: yellow block at left
End: bright green block at right

Hidden inside the disc is early maps of various levels. These maps don't go into very much detail and in a few cases disagrees with the level layout found in the final game.

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:

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. (But it doesn't remember what stage you went in though so you'll have to use cheats!)
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.

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.
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. Video of cutscene viewer

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:

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!

For level 2, a level which does not exist in any released version of the game:

1st Mission: This stage is cool!

These texts can be seen ingame via RAM editing in the PC version.

Unused Chao Doctor Lines

In the dreamcast version of Sonic Adventure 2 the Chao Doctor in the Kindergarten describes the player's Chao with a variety of text that was removed in subsequent ports. Among the lines the Chao Doctor uses are those that describe the player character's relationship with the Chao. Surprisingly, when viewing the game's files it can be seen that the Chao Doctor also contains lines for Amy:

Looks like this Chao likes Amy a lot.
Looks like this Chao likes Amy.
Looks like this Chao wants to be friends with Amy.
Looks like this Chao doesn't like Amy.
Looks like this Chao hates Amy.

Cheat device codes

These are cheat codes that can only be used with game enhancer devices.

Codebreaker

Code	Description
0F0C0D76 + 00000008 or DBD30740 + 9C684CF8	Enable Code (Must Be On).
0D1974A8 + 0000FFEF + 01DE6DA0 + 0000003A	Debug Fly on Dpad Up.
01DE6DA6 + 00000001	Godmode.
010DB26C + 00000004	Infinite Lives.
010DB270 + 000003E7	Max Infinite Rings.
020DB294 + 05F5E0FF	Max Score (A ranking).
01052C18 + 00000009 or E2071FD0 + 00000009	Stop Timer.
0124EE6C + 00000000	Always Sonic.
0124EE6C + 00000001	Always Shadow.
0124EE6C + 00000004	Always Knuckles.
0124EE6C + 00000005	Always Rouge.
0124EE6C + 00000006	Always Tails.
0124EE6C + 00000007	Always Eggman.
0D1974A8 + 0000FFFB + 0124EE6C + 00000000	Sonic-Hold A while loading.
0D1974A8 + 0000FFFD + 0124EE6C + 00000001	Shadow-Hold B while loading.
0D1974A8 + 0000FBFF + 0124EE6C + 00000004	Knuckles-Hold X while loading.
0D1974A8 + 0000FDFF + 0124EE6C + 00000005	Rouge-Hold Y while loading.
0D1974A8 + FE000000 + 0124EE6C + 00000006	Tails-Hold L trigger while loading.
0D1974A8 + FD000000 + 0124EE6C + 00000007	Eggman-Hold R trigger while loading.
0124EE64 + 000000??	Modify which level loads on Stage Select. 00 - TEST LEVEL 03 - Green Forest 04 - White Jungle 05 - Pumpkin Hill 06 - Sky Rail 07 - Aquatic Mine 08 - Security Hall 09 - Prison Lane 0A - Metal Harbor 0B - Iron Gate 0C - Weapons Bed 0D - City Escape 0E - Radical Highway 0F - 2 Player - Weapons Bed Area 10 - Wild Canyon 11 - Mission Street 12 - Dry Lagoon 13 - Boss: Sonic vs Shadow at Green Forest 14 - Boss: Tails vs Eggman at Weapons Bed 15 - Sand Ocean 16 - Crazy Gadget 17 - Hidden Base 18 - Eternal Engine 19 - Death Chamber 1A - Egg Quarters 1B - Lost Colony 1C - Pyramid Cave 1D - Boss: Tails vs Eggman at the Ark 1E - Final Rush 1F - Green Hill 20 - Meteor Herd 21 - Boss - Rouge vs. Knuckles at Meteor Herd 22 - Cannon's Core - Sonic 23 - Cannon's Core - Eggman 24 - Cannon's Core - Tails 25 - Cannon's Core - Rouge 26 - Cannon's Core - Knuckles 27 - 2 Player Battle - Mission Street 28 - Final Chase 2A - Boss: Sonic vs Shadow at Ark Runway 2B - Cosmic Wall 2C - Mad Space 2F - Mini Stage - Pyramid Race 30 - 2 Player - Sand Ocean 31 - Mini Stage - Pool Quest 32 - Mini Stage - Planet Quest 33 - Mini Stage - Deck Race 34 - Mini Stage - Downtown Race 35 - 2 Player - Ark 36 - Mini Stage - Grind Race (will crash game) 37 - 2 Player - Lost Colony 38 - 2 Player - Ark 39 - 2 Player - Metal Harbor 3A - 2 Player(?) - GUN 3B - 2 Player - Death Chamber 3C - Boss - Big Foot 3D - Boss - Hot Shot 3E - Boss - Flying Dog 3F - Boss - King Boom Boo 40 - Boss - Egg Golem 41 - Boss - Biolizard 42 - Boss - FinalHazard 46 - Route 101 (And Route 280...) 47 - Kart Racing 5A - Chao World

Gameshark

Code	Description
65A0EE4D + 9C684CF8 + 00000000	Master Code - MUST BE ENABLED!
E2071FD0 + 00000009	Stop timers.
1A0C11D6 + 00000009	Infinite Lives.
141C11D7 + 01052270 + 000003E7	Infinite Rings.

Action Replay

Code	Description
FE198DC3 + 000003E7	999 Rings.
AED34AD4 + 00000004	Infinite Lives.
D0C0989A + 00000000	Stop timer.
77F5C847 + 00000000	Turn on Debug mode (WARNING: Very Glitchy).