At the Main menu press Up, Up, Down, Down, Y, Down, Up, Y to unlock the Cheat Screen then select the 'Add Cheat' option before entering any of the following Case-Sensitive Cheats to unlock the corresponding effect. These codes are case sensitive.

Unlocks ALL Levels and Emergencies:
KEYTOTHECITY

Unlock Long Range Stungun:
FRYINGTIME

Unlock Mini gun (replaces the Pistol):
MINIFUN

Bullets Set Fire to Enemies (similar to one hit kills):
BURNINGBULLET

Thermal Breather MK2 (for visibilty in smoke):
ISEEYOU

Unlock MK3 Assault Rifle with Unlimited Grenades:
ULTIMATEPOWER

Unlock MK4 Pistol:
ZEROTOLERANCE

Unlock No Heads:
KEEPYOURHEAD

Unlock Disco Mode:
DANCINGFEET

Unlock Terror Mode:
BURNERSREVENGE

Helium Voices:
WHATWASTHAT

Unlock the 'Cheat' screen at the Main menu by pressing Up, Up, Down, Down, Y, Down, Up, Y before entering one of the following case-sensitive codes.

Unlock Terror Difficulty:
BURNERSREVENGE

Unlock ALL Levels and Emergencies:
KEYTOTHECITY

Unlock Disco Light Mode:
DANCINGFEET

Unlock Thermal Mk2:
ISEEYOU

Unlock Assualt Rifle Mk3 with Infinite Shells:
ULTIMATEPOWER

Unlock Pistol Mk4:
ZEROTOLERANCE

Unlock Headless Enemies:
KEEPYOURHEAD

Unlock Mini-Gun:
MINIFUN

Shot Sets Enemy on Fire:
BURNINGBULLET

Unlock Squeaky (Helium) Voices:
WHATWASTHAT

Unlock Terror Difficulty Mode and other Levels of Medals:
Successfully complete the game.


Unlock Armor, Weapons and Upgrades

Unlock Extra Pistol Clip:
Collect 2 Medals

Unlock Shield Mk. 2:
Collect 4 Medals

Unlock Pistol Damage Upgrade:
Collect 6 Medals

Unlock T-Zero Body Armor:
Collect 8 Medals

Unlock Smoke Grenades:
Collect 10 Medals

Unlock Stun Gun Mk. 2:
Collect 12 Medals

Unlock Riot Grenades:
Collect 14 Medals

Unlock Second Extra Pistol Clip:
Collect 16 Medals

Unlock Shotgun Damage Upgrade:
Collect 20 Medals

Unlock Grenade Belt:
Collect 24 Medals

Unlock Extra Shotgun Clip:
Collect 28 Medals

Unlock Assault Rifle Damage Upgrade:
Collect 32 Medals

Unlock Pistol Mk. 2:
Collect 36 Medals

Unlock Extra Assault Rifle Clip:
Collect 40 Medals

Unlock T-Zero Battle Armor:
Collect 45 Medals


Unlockable Emergency Missions

Unlock Emergency - Downtown:
Capture 1 Gang Leader Alive

Unlock Emergency - South Side Lot:
Capture 2 Gang Leaders Alive

Unlock Emergency - Dockyard:
Capture 4 Gang Leaders Alive


Unlockable Weapons

Shotgun Mk. 1:
Complete 1 Emergency Situation

Unlock Assault Rifle Mk. 1:
Complete 2 Emergency Situations

Shotgun Mk. 2:
Complete 3 Emergency Situations