Successfully complete each of the twenty-five challenge mode levels to transform the mice into Chaos from Sonic Adventure.

Successfully complete each of the twenty-five mania mode levels to transform the mice into angels from NiGHTS.

Successfully complete all puzzles in normal mode.

Successfully complete all puzzles in hard mode.

Successfully complete all puzzles in special mode.

During a battle game, press L or R to taunt your opponent. Hold L or R to choose which taunt to use. You can also taunt after you have won at the congratulations screen.

Pause the game and press X + Y.

You can save pictures onto your VMU while using Chu Chu Rocket's Dreamkey web browser. Place the cursor over the desired picture and press X + A on the controller.

This trick requires a Dreamcast keyboard, and can be used as a replacement for the standard Planetweb browser. Go to the Homepage in the main menu. Once the Chu Chu Rocket title appears, press [Ctrl] + O on the keyboard. The URL bar will appear, which allows you to type in any Internet address.

Some advantages of the Dreamkey web browser include:

Better list interface and has arrow bars, which makes it appear closer to a computer web browser.
Supports Flash 3.
Better Javascript than the Planetweb browser.
Ability to send and receive e-mail with VMU files attached.
Higher on-screen color count than Planetweb browser.
Can Save Midi or Wav files to the VMU.
Pages appear to load faster.
Supports cookies.

Keyboard shortcuts:

URL bar: [Ctrl] + O
Reload page: [Ctrl] + R
Bookmarks: [Ctrl] + B
Mail: [Ctrl] + M
History: [Ctrl] + H