Kill as many enemies as possible and to do so with style. Points are awarded for killing enemies, and depending on how you kill them, you will be awarded additional points.
You are only allowed to carry two weapons at a time, plus your lead pipe. If you have fewer weapons, any that you walk over will be automatically added to your inventory. If a weapon is allowed to be dual wielded, you will automatically pick up its companion weapon.
Use WASD to move, the MOUSE to aim, LEFT CLICK to fire. Use Q and E to switch weapons, F to grab, SPACE to exchange weapons. Hit P to pause the game and show the menu.