Press CAPS LOCK during gameplay to pause the game and then type these codes in.
DJARUM Lets you pass through the mushrooms
HECTOR This code gives you eight lives
MORRISON This code completes the level
NALA You become invincible
NICEBOX Gives you the curve gun
NUKE EM Almost all of the mushrooms are destroyed
SQUISH Gives you the Machine Gun
USMC Gives you a 5,000 bonus