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To restore your health by twenty-five points, insert the following button sequence on any stage while playing the game: Up, Up, Down, Down, Left, Right, Left, Right, Circle, X. Cheat: Restore Ammo To restore ammunition on your currently-equipped weapon to maximum, insert the following button sequence on any stage while playing the game: Triangle, Circle, X, Square, R1, Triangle, Square, X, Circle, R1. Unlockable: All Levels (Half-Life 2) To unlock all of the game's levels, insert the following button sequence on any stage while playing the game: Left, Left, Left, Left, L1, Right, Right, Right, Right, R1.  
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