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Half-Life

Codes

Invincibility

At the cheat menu press these buttons in the following order; left, square, up, triangle, right, circle, down, x.

Invisiblility

At the cheat menu press these buttons in the following order; left, square, right, circle, left, square, right, circle.

Infinite ammo

At the cheat menu press these buttons in the following order; down, x, left, circle, down, x, left, circle.

Alien mode

At the cheat menu press these buttons in the following order; up, triangle, up triangle, up, triangle, up, triangle.

Slow-motion mode

At the cheat menu press these buttons in the following order; right, square, up, triangle, right, square, up, triangle.

Xen Gravity

At the cheat menu press these buttons in the following order; up, triangle, down, x, up, triangle, down, x.