You return to the past to save the world, but you fall in enemy territory. Kill all your enemies to complete all levels!
A/D keys to move to left/right. Click to shoot. E key to use items. SHIFT or S key (or arrow key down) to crouch. Space bar, W key or arrow key up to jump. To switch weapons use the 1-9 keys. To launch a grenade use the G, INS or ENTER key. P key to pause. WARNING: the game includes violent scenes (blood, dismemberment); you can disable them in the options menu to get a softer version.