I grepped /usr/share/dict on my FreeBSD computer for six-letter words consisting entirely of valid Game Genie code letters. Some codes on some games actually do useful things - for example, EGGPIT on Nintendo Tetris causes an earthquake, while ATTAIN doesn't let you play the game.
Valid HTML 4.0?
Modified Sun Mar 25 08:48:47 2007
generated Sun Mar 25 08:56:33 2007