Bonuses
To get these following cheats you must earn them as follows
SNIPERMUNCH
Alien gains long-distance jaw attack - Defeat the first Alien Level (Temple) and score 10 live civilian head bites.
NAUSEA
Screen shakes and moves - Defeat the second Alien Level (Escape) in less than two minutes.
PIPECLEANER
All characters are shown as Pipecleaners or skeletons - Defeat the third Alien level (Ferarco) with 15 civilian head bites.
MOTIONBLUR
Screen becomes blurry - Defeat the fourth Alien Level (Gateway) in under four minutes with an average of 9 m/s or greater.
MIRROR
Displays a mirror of your Level - Defeat the fifth Alien Level (Earthbound) with one live Predator head bite.
JOHNWOOMODE
Game slows down when you attack or being attacked - Defeat the first Marine Level (Derelict) with 80 per cent head shots.
GRENADE
Stocks you Pulse Rifle with 99 grenades but no bullets - Defeat the second Marine Level (Colony) with 40 per cent accuracy.
WARPSPEED
Run fast - Defeat the third Marine Level (Invasion) in less than four minutes.
LANDOFTHEGIANTS
Makes you small - Defeat the fourth Marine Level (Orbital) using less than 20 shots.

SLUGTRAIL
Aliens crawl on floor - Defeat the fifth Marine Level (Tyrargo) with 32 Alien kills.
PIGSTICKING
Predator's Spear gun has unlimited ammo and multifire - Defeat the first Predator Level (Waterfall) with 80 percent accuracy.
BALLSOFIRE
Enemies always on fire - Defeat the fourth Predator Level (Fury 161) with 40 Alien kills
IMPOSSIBLEMISSION
Game becomes more difficult - Defeat the second Alien Bonus Level with 20 live Marine head bites.

TICKERTAPE
Aliens have trail - Defeat the first Predator Bonus Level (Invasion) with 15 Alien trophies.
TRIPTASTIC
Screen becomes Jittery, blurry and a Rainbow effect - Defeat the second Predator Bonus Level (Escape) with 10 civilian trophies.