Press Start to pause game play, then press X + Y.
Complete all puzzles in hard mode.
Complete all puzzles in normal mode.
Complete all puzzles in special mode.
Complete each of the twenty-five challenge mode levels to transform the mice into Chaos.
Complete each of the twenty-five mania mode levels to transform the mice into angels
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.
Place the game disc in a PC compatible CD-ROM drive to find artwork in the "extras" folder.