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Half-Life
Invincibility, Alien Mode, and More:
Simply enter theses codes on the Cheat screen:
Invincibility:
Left, Square, Up, Triangle, Right, Circle, Down, X.
Unlimited Ammo:
Down, X, Left, Circle, Down, X, Left, Circle.
Slow Motion:
Right, Square, Up, Triangle, Right, Square, Up, Triangle.
Invisibility:
Left, Square, Right, Circle, Left, Square, Right, Circle.
Alien Mode:
Up, Triangle, Up, Triangle, Up, Triangle, Up, Triangle.
Low Gravity:
Up, Triangle, Down, X, Up, Triangle, Down, X.
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