Full Pause Screen
Press Start to pause game play, then press X + Y.

Hidden Artwork
Place the game disc in a PC compatible CD-ROM drive to find artwork in the "extras" folder.

Dreamkey Web Browser
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. This is same browser that the Europeans and Japanese Dreamcast owners have access to.

Some advantages of the Dreamkey 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 email 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

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

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

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

Hard Mode Puzzles
Successfully complete all puzzles in normal mode.

Special Mode Puzzles
Successfully complete all puzzles in hard mode.

Mania Mode Puzzles
Successfully complete all puzzles in special mode.

Taunt Opponents
Press L or R during the battle games to taunt your opponent. Hold L or R to choose which taunt to use. You can also taunt even after you have won at the congratulations screen.