PlayStation 2 :: Half-Life Cheat Codes
InvincibilityAt the cheat menu, press Left, Square, Up, Triangle, Right, Circle, Down, X.
Infinite ammunition
At the cheat menu, press Down, X, Left, Circle, Down, X, Left, Circle.
Invisibility
At the cheat menu, press Left, Square, Right, Circle, Left, Square, Right, Circle.
Slow-motion mode
At the cheat menu, press Right, Square, Up, Triangle, Right, Square, Up, Triangle.
Alien mode
At the cheat menu, press Up, Triangle, Up, Triangle, Up, Triangle, Up, Triangle.
Xen gravity
At the cheat menu, press Up, Triangle, Down, X, Up, Triangle, Down, X.
Game Shark Codes
| Master Code (Must Be On) | EC8783A8 1431D934 |
| Unlock Alien Mode Cheat | 4CA573BA 1456F025 |
| Unlock Infinite Ammo Cheat | 4CA57372 1456F025 |
| Unlock Invincibility Cheat | 4CA5735A 1456F025 |
| Unlock Invisibility Cheat | 4CA5738A 1456F025 |
| Unlock Slow-Motion Cheat | 4CA573A2 1456F025 |
| Unlock Xen Gravity Cheat | 4CA57342 1456F025 |
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