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| Enemy Soldiers! |
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| Insane Research! |
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| | Half-Life |
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- Invincibility - At the Cheat Code screen, press Left, Square, Up, Triangle, Right, Circle, Down, X, Start.
- Unlimited Ammo - At the Cheat Code screen, press Down, X, Left, Circle, Down, X, Left, Circle, Start.
- Unlock Alien Mode - At the Cheat Code screen, press Up, Triangle, Up, Triangle, Up, Triangle, Up, Triangle, Start.
- Unlock Invisibility - At the Cheat Code screen, press Left, Square, Right, Circle, Left, Square, Right, Circle, Start.
- Unlock Slow Motion Mode - At the Cheat Code screen, press Right, Square, Up, Triangle, Right, Square, Up, Triangle, Start.
- Unlock Xen Gravity - At the Cheat Code screen, press Up, Triangle, Down, X, Up, Triangle, Down, X, Start.
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