Secret Multiplayer Maps:
At the 'Cheat Codes' screen under the 'Settings' menu enter the following - Left, L, X, Left and White, Y, X, Black.


Weapon Upgrades


Bulldog:

Fire Accelerator - Increases fire rate

Recoil Stabiliser - Increases accuracy

Armor-piercing - Increases damage


Grenade Launcher:

Remote Detonator - Increases ammo to 8; allows for manual trigger

Fragment Attraction - Increases blast size and ammo to 10

Target Leech - Increases ammo to 12


Frag Rifle:

Servo-Reloader - Increase reload speed

Magneto Concentrator - Creates a laser mine at close range

Titanium Concentrators - Creates a stronger mine at close range


Healing Tool:

Fast Injector - Faster doses mean faster health restore

Health Boost - Adds one life point

Adrenal Boost - Adds one more life point


Plasma Gun:

Arc Sphere - Charge weapon to unleash damage orb

Defense Sphere - Damage orb endures longer and explodes on contact

Explosive Sphere - Damage orb endures longest; explosion is larger


Rocket Launcher:

Heat-Seeking - Warhead heat-seeks after holding trigger and firing

Dual Warheads - Two warheads fired

Quad Warheads - Four warheads fired


Sniper Rifle:

Enhanced Vision - Highlights enemies in scope view

Increased Ammunition - Increases ammo to 6 in magazine, 18 reserve

Armor-piercing - Increases damage