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XBox - Half-Life 2 cheats

Restore ammo for the current weapon:
During game play, push Y, B, A, X, white, Y, X, A, B, white buttons on your 
Xbox controller to get refill the ammunition.

Stage selection:
During the game play, push Left, Left, Left, Left, Black, Right, Right, Right, 
Right, White buttons on your Xbox controller to get access to all stage and 
choose any of them.

Spawn medipack:
During the game play, push Up, Up, Down, Down, Left, Right, Left, Right, B, A 
buttons on your Xbox controller to get a medipak and restore 25 points of health.