As a cop, you and your partner shoot to kill the incoming wave of zombies, undead and bats on the street. If you let each of a kind to cross the street you lose. Shoot power ups to earn crossfire, spread shots and remember head shots give more points. As you advance in phases both cops are upgraded.
Use the mouse to aim and shoot. Press Spacebar to pause game. Press 1-4 for laser beam. Press Q A Z to move left cop and W S X to move right cop.