Help Andy Law to liquidate all zombies in this version of the game.
W-A-S-D keys to move; J key to attack, K to change clip, B to buy weapons; you always can press the H key for help. When the enemy is near to you, the J key allows you to attack with the knife. Double click in the base to go faster. There's different kinds of attacks when you press the J or K keys combined with the left/right movement keys.