While playing, press Left, Circle, X, Right, Circle, X, Down, Circle, X. A list of cheat codes will appear. Here's what they mean:
Invincible god mode
Coords shows current position
Palmode turns screen to black and white
Supermap shows the full map of the level
Maxout all weapons and ammo
Pogo lets you jump to high places you can't normaly reach
Ponder turns thinking off
Gamewon skips level
Free Batteries
When playing Dark Forces you will see little box droids moving around on the floor. Shoot these little droids to get batteries for your fashlight and other objects that use batteries.
Level Select
To access any level, enter the password "X7P!45QX39".
Passwords
The Force will be on your side when you're armed with these passwords.