Press ESC then type in these codes:

Kahuna - Add explosions, omniscient view, and invulnerability

Invulnerable - Invulnerable Sarge

Plethora - Full ammo

Occultation - Stealth mode

Aeroballistics - Full air support

Paralysis - Frozen enemies

Telekinetic - Teleport sarge - activate scroll mode first

Triumph - Win scenario

Succumb - Lose scenario

Omnisicient - Overall view toggle

Pyromancer - Right button explosion toggle