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Half-Life Cheats
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Alien mode
At the cheat screen, enter code
Code: Up, Triangle, Up, Triangle, Up, Triangle, Up, Triangle
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Bonus levels
At the cheat screen, enter code
Code: Triangle, Square, Left, Right, Circle, X, Up, Down
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Invincibility
At the cheat screen, enter code
Code: Left, Square, Up, Triangle, Right, Circle, Down, X
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Invisibility
At the cheat screen, enter code
Code: Left, Square, Right, Circle, Left, Square, Right, Circle
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Slow motion mode
At the cheat screen, enter code
Code: Right, Square, Up, Triangle, Right, Square, Up, Triangle
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Unlimited ammunition
At the cheat screen, enter code
Code: Down, X, Left, Circle, Down, X, Left, Circle
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Xen gravity
At the cheat screen, enter code
Code: Up, Triangle, Down, X, Up, Triangle, Down, X
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Using the pistol
Use the following trick to save ammo for all guns other than pistol. Most creatures or persons can be killed with five or less direct shots of the pistol.
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Using the pistol Spitters
4 shots
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Using guards
If you have a guard, if you get close enough to him, he will take care of almost anything for you. You will only need to fire if the creature is close to the guard.
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Using the pistol Crabs
2 shots or 1 crowbar hit
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Using the pistol Electric aliens
3 shots
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Using the pistol Trip bomb
1 shot
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Using the pistol Zombies
4 shots
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Using the pistol Machinegun on stand
5 shots
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Using the pistol Soldiers
5 shots
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Using the pistol Dogs
3 shots
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Defeating the giant alien on POWER UP
All you have to do is get about 10 bombs and throw them at him. He'll fight back but keep backing up far in the hall. Sooner or later he will blow up.



