Enter the following codes for the desired effect:

God mode: NOPAINNOCANE
Level select: COOLLEVELCHEATCODE
Skip level: YESTERDAYYOURZEBRADIE
Full map: YESTERDAYYOURZEBRADIVORCED
Unlock doors: ANYANDALLCODE
Restore health: CANEREADYTOROCK
Unlimited ammo: FISHINABARREL
All weapons: CHARLIEHUSTLEOVERDRESSEDROMEO
Level up weapons: FRIENDLIESTGODINGALAXY
Big feet mode: DEADREDPARTYSHOES
Big head mode: BUTTCHEATCANSURPRISE
Enemies thwarted or frozen: CHARLIEOSCARLIMADELTA
Time factor: CHARLIEALPHANOVEMBERECHO
Programmer message: GOODGODHELPME

Note: A sound will confirm that the code was entered correctly.