Shanghai Cheat Codes for Gameboy

SPECIAL MODES
Begin a game and press Select to pull up the Options menu.
Select "New Game" and push A. You can enter in three letters: ZAP - Adds a zapping sound effect to game.
STF - Allows you to view the credits
MAN - Makes fewer tiles for an easier game.
REV - For a game where all the tiles are reversed. When you
select a tile it turns over. You must remember where the tiles
are to find matches.