Hold Pause with Option and keep them pressed during the entire process. Press 1+ 3. Then press 2 + 5 + 7 + 9. The Predator will laugh to confirm the cheat code entry.
10/15/2002
Debug Mode
Begin a game, then press Pause, Option, 6, 1+3, B, A, 9, A, 9, A, *, Option, 6, #, *, *, Option, 2, Option. The Predator will laugh to confirm the code. Hold Option and enter any of the sequences below.
General: A - Next Floor B - Previous Floor 5 - God Mode