Cheat Mode:

Use ALIEN /j to start the game. Then press HOME to enable the cheats.

Just press the button of the cheat you want during gameplay.

C       Bring up a cheat menu
O       Invincibility
R       Full health
M       Become an Eye Evid
L       Jump
I       World map
B       Turn collisions off
H       Kill yourself

Thanks to Revolution readers Andrew D. Moore!