All Weapons:
Use a small control pad and enter "11692" .

Unlimited ammunition:
Use a small control pad and enter "61166" .

Big head mode:
Use a small control pad and enter "10397" .

Weapons:
Use on Humans the Shotgun or the Assault Rifle, on Fixers EMP, then the
Shotgun, for creatures the Shotgun and for Military Mechs EMP.

Concept Art:
To access the concept art developed for the game, press left, right, up,
down, down, circle on the title screen. If done correctly the screen
flashes.