Video game cheats for all your favourite video games.

Cheats: 3DO - Amiga - Arcade - Atari 2600 - Atari 5200 - Atari 7800 - CD-i - Colecovision - Dreamcast - DVD Video - Game Cube - Game Gear - Game.Com - GameBoy - GameBoy Advance - GameBoy Color - Genesis - Intellivision - Jaguar - Lynx - Macintosh - Master Systems - N-Gage - Neo*Geo - Neo*Geo Pocket - NES - Nintendo 64 - Nintendo DS - PC - Windows - Pinball - Playstation - Playstation 2 - PSP - Saturn - Sega 32X - Sega CD - SNES - TurboGrafx 16 - Vectrex - Virtual Boy - Xbox - Xbox 360

GameBoy Cheats: Cosmo Tank Cheats

Sound Test
On the subscreen at the beginning of the Quest Mode, simultaneously press and hold Down, A and B. While holding these, press Start. If this is done correctly, the message "Sound Test 01" will appear.