Half-Life

Written by John Scalzo  on January 04, 2007

Cheat Codes: Watch out for the head crab!

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Cheat Codes
Enter these codes at the Cheat Menu.

Alien Mode: Up, Triangle, Up, Triangle, Up, Triangle, Up and Triangle
Bonus Levels: Triangle, Square, Left, Right, Circle, X, Up, Down
Infinite Ammo: Down, X, Left, O, Down, X, Left, O
Invincibility: Left, Square, Up, Triangle, Right, Circle, Down, X
Invisibility: Left, Square, Right, Circle, Left, Square, Right, Circle
Slow Motion: Right, Square, Up, Triangle, Right, Square, Up, Triangle
Xen Gravity: Up, Triangle, Down, X, Up, Triangle, Down, X