Unlockable: Infinite Ammo
Beat the game on normal difficulty to unlock infinite ammo. You'll need to enter this code again at the start of each level, if you are killed or have to retry.

Unlockable: Levels
Create a profile called BAKERSDOZEN to unlock all of the levels in the game.

Unlockble: Black And White Mode
Beat easy difficulty to unlock the "Old Movie" cheat. This makes the game look like an old-time movie.

Unlockable: Authentic Mode
Beat the game on the hardest difficulty. This mode has no checkpoints, saves, icons or reticules. Good luck!

Unlockable: Super Squad
Beat the game on authentic mode to unlock the super squad cheat.