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From Sonic Retro

Lost Graphics

Artwork	Name	Description
	Time Stopper Item	This may have been a time-stopping item with a similar effect to Chaos Control. It also could have been related to E-102's levels in some way, which were based around a countdown timer.
	Lost Chao Emoticons	These would have appeared over the Chao's head but do not appear in normal gameplay.
	Tornado Life Gauge Graphics	The red "Tornado" life gauge is used in Sky Chase Act 1 and Sky Chase Act 2. However, when Tails transforms the Tornado into the Tornado 2, it still uses the same life gauge. This blue "Tornado2" gauge is never used.

E-105 is built of Dreamcasts

Some textures used for E-105 are actually Dreamcasts.

Removed Cowgirl Billboard

For unknown reasons, a cowgirl billboard from Casinopolis that was present in the first version of Sonic Adventure in Japan was removed from other releases. This includes the Japanese re-release called Sonic Adventure International. It may have been removed due to it being rather provocative.

Beta Title Screen

A prototype Title screen was found inside the disc.

Old Character Select Screen

Six images were found in the game that appear to be a old character select screen. ("Choose Your Buddy" as seen in these pictures is the name of the song on the soundtrack that plays on the character selection screen.)

Beta Loading Screen

A prototype loading screen was found inside the disc.

Sky Chase Dragon

In Sonic Adventure DX: Director's Cut (preview), a model of an unused three-headed Sky Chase Dragon boss was found by GrandMasterJimmy.[1] The model viewer used to find him has all the polygons stacked together in one place so it doesn't look right. The left image shows what was found, the right image shows how he should look when properly assembled, textured, and colored.

Final Egg Hidden Room

A small hidden corridor can be accessed behind the door pictured in the above image. To reach it, the player needs to start a Spin Dash on the edge of the bridge facing it. At the bottom of the corridor the camera stops, so the player has to rely on the first person camera to look at the surrounding environment. At the end is a dead end where the player cannot return.

Hidden Casinopolis Corridor

In the ceiling above this area and behind the striped object, Tails can fly to a unused corridor. When flying out, a strip of land will become visible. When Tails lands on it, he will go through the ceiling. This hidden part of the level seems to be fairly complete as there are monitors and rings.

Real Sonic

This was most likely a joke image. It is found within the disc, but is not accessible normally.

Tokyo Game Show - How-to-Play

Tails' Instructions	Tails' Instructions part 2	Sonic's Instructions	Sonic's Instructions part 2
Knuckles' Instructions	Knuckles' Instructions part 2	E-102's Instructions	E-102's Instructions part 2
Big's Instructions	Big's Instructions part 2	Amy's Instructions	Amy's Instruction part 2

Within most versions of Sonic Adventure remain How-to-Play pictures from the TGS version of the game. There are no English versions of these files.

Unused voice Clips

Through digging, several unused Tikal voice clips were found inside the game.

• Tikal talks about Super Sonic ^(info) - This indicates that Super Sonic was meant to be usable in regular levels. It is also possible that the player was once required to manually collect the Chaos Emeralds before the Perfect Chaos boss, and this voice clip explained what to do afterwards.
• Tikal tells you about the Leon badnik ^(info)
• Tikal talks about "Golah" ^(info)

There are also several clips that can be found that discuss the Chao Gardens, some of which include information inconsistent with how the final game works ("Don't put more than six Chao in a garden" and its variations, for example.)

Sonic Adventure Levels
Sonic Adventure Main Article Badniks Bosses Bug List Game Development Game Secrets Music: Vox/OST/Remix Cheat Codes Commercials SCHG	Sonic Adventure DX: Director's Cut Main Article ← ← Bug List ← Game Secrets ← Cheat Codes Commercials SCHG: GC/PC	Adventure Fields:     Station Square Mystic Ruins Egg Carrier     Action Stages: Emerald Coast Windy Valley Casinopolis Ice Cap Sky Chase Act 1 Twinkle Park Speed Highway Red Mountain Sky Chase Act 2 Sky Deck Lost World Final Egg Hot Shelter Sand Hill