Sonic Adventure/Hidden content

Lost Graphics

Artwork	Name	Description
File:Sa1protoitem tstop.jpg	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 focused more on time.
File:Chao emo1.jpg File:Chao emo2.jpg File:Chao emo3.jpg File:Chao emo4.jpg	Lost Chao Emoticons	These would have appeared over the Chao's head but do not appear in normal gameplay.
File:Sa tornado2.jpg	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

320px

Some textures used for E-105 are actually Dreamcasts. Could Dreamcast really be advanced enough to power a robot?

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

320px

A prototype Title screen was found inside the disc.

Old Character Select Screen

280px 280px 280px 280px 280px 280px

Six images were found in the game that appear to be a old character select screen.

Beta Loading Screen

A prototype loading screen was found inside the disc.

Sky Chase Dragon

After the release of the Sonic Adventure DX: Director's Cut (preview) version the model for the unused 3 headed Sky Chase Dragon boss was found in this version too 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 you need to start a Spin Dash on the edge of the bridge facing it. At the bottom of the corridor the camera stops so you have to rely on the first person camera to look at the surrounding environment. At the end is a dead end so you'll be stuck and will have to jump into the pit of death.

Hidden Casinopolis Corridor

In the ceiling above this area and behind the striped object you can fly with Tails to a unused corridor. When flying out look for a strip of land and when you land on it you will go through the ceiling. This level seems to be fairly complete as there are monitors and rings.

Real Sonic

This was probably a joke image. It is found within the disc but isn't accessable 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) (370 kB) - This indicates that Super Sonic was meant to be usuable in regular levels. It is also possible that you were 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) (107 kB)
• Tikal talks about "Golah" ^(info) (133 kB)