Click on the screen to fire bullets at the zombies. Target your shots carefully to strike zombies directly or take advantage of wall rebounds for indirect hits. Drag your character to escape zombie attacks and stay alive. Pick up power-ups to improve your firepower or acquire special abilities. Move forward through the game by destroying all zombies in each level. Watch out for increasing zombie numbers and speed as you enter higher levels. Use strategic shooting to optimize your score by taking down multiple zombies with a single bullet.