All Levels + Unlimited Ammo + Invincibility:
Hold L2 + R2, press Left, Down, Right, Up.
on the title screen.
Cheat menu codes:
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CLAW Egypt fodder - 2p.
GODDESS Female Trooper - 2p.
GODLY God mode.
UGLY Hive Fodder - 2p.
LEGGY Hive Guard - 2p.
SORTED Infinite ammo.
SKIPPY Level select.
COLDENPIE Unlock all cheats.
LOADED Unlock all weapons.
RUBBER Volcano Guard - 2p.