Cheat mode:
Press Up, Up, Down, Down, Circle, Down, Up, Circle at the main menu screen. A "Cheat" option will now appear at the title screen. Select that option, then enter one of the following case-sensitive codes to activate the corresponding cheat function, which can be toggled on or off (except for "All levels and emergencies").
All levels and emergencies:
Enter KEYTOTHECITY as a code.
Long range stungun:
Enter FRYINGTIME as a code.
Minigun instead of pistol:
Enter MINIFUN as a code.
MK3 assault rifle with unlimited grenades:
Enter ULTIMATEPOWER as a code.
MK4 pistol:
Enter ZEROTOLERANCE as a code.
Bullets set fire to enemies:
Enter BURNINGBULLET as a code.
Thermal breather MK2 has better smoke visibility:
Enter ISEEYOU as a code.
Squeaky voices:
Enter WHATWASTHAT as a code.
No heads:
Enter KEEPYOURHEAD as a code.
Disco mode:
Enter DANCINGFEET as a code.
Terror mode:
Enter BURNERSREVENGE as a code.
(41 votes)
Source: Official Website
