These codes are entered after pressing start during gameplay. Select the "Cheats" section.

Unlimited Ammo- SORTED
Level Select- SKIPPY
Fast Run- SONIC
Pen and Ink- SKETCHY
All Cheats- GOLDENPIE

Multiplayer- You can only use these codes one at a time.
Female Trooper- GODDESS
Hive Guard- LEGGY
Volcano Guard- RUBBER
Egypt Fodder- CLAW
Hive Fodder- UGLY