Welcome to the cheats for Half-Life for the PlayStation 2. Below are the cheats.
Invincibility
At 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.
