Tails in Action Stages
When you are playing Sonic's action stages and Tails is on the screen, a second player can control Tails with a second controller. Any rings Tails collects will be added to Sonic's totals. Be careful to not make Tails break open any shield, invincibility or One Up item boxes as those will not be added to Sonic and will be wasted.
Play as Super Sonic
Play through the game with every character and the 7th character "Super Sonic" will be opened. This is the only real way to fight Perfect Chaos, the final boss.
Secret Chao Puzzle Game
After you start up the Sonic Adventure game, place a controller into the D port on your Dreamcast and have a VMS in the controller. A hidden Chao Puzzle game will appear on the VMS screen. It is a tile based puzzle game where you have to use the Dreamcast's controller to move the pieces of a moving picture around to win. After every five puzzles you solve, a little animation will play on the VMS screen.
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