To access a new background screen, apply the code "MLGTXXF" to the file GameGuru.CFG. Once applied, reboot the 3DO and enjoy the scenery.
For your listening pleasure, the makers have included some extra soundtracks. To hear them, patch GameGuru.CFG with the code "SONGx", where x is a number from 1 to 9.
To view a hidden video about the Game Guru's makers, patch the file GameGuru.CFG with the code "IHAVETHEVIDEO2".