There is a Game Genie code decoder/encoder here: http://www.smspower.org/maxim/forumstuff/gamegenie.html http://www.smspower.org/maxim/forumstuff/gamegenie.htm

There is a Game Genie code decoder/encoder here: http://www.smspower.org/maxim/forumstuff/gamegenie.html http://www.smspower.org/maxim/forumstuff/gamegenie.html (This was designed for the Sega Game Gear version, but the Game Boy algorithm is the same.)