Jack - the only savior of the city from the zombies and werewolves. To his mission did not become a failure, help the boy. To do this, you need to focus on the field with colored balls. Destroy groups of three or more identical balls by clicking on them with the mouse, and the hero will shoot at the approaching monsters. Hurry up with the search for large groups, it affects the accuracy and power of the shot, after the next attack come to the store and buy new equipment and weapons.