You are the tower. Use 123 to swap between weapons. You have 60 seconds to fend off as many zombies as you can without killing the civilians before the rescue helicopter takes off. Dont kill civilians and kill zombies, The number in the top right is the timer. The top left is the helicopter's health. And the variable on the top middle is the gun you are holding. 1 swaps to the SMG, it fires in a straight line. 2 swaps to the shotgun, it fires in the big red circle. 3 swaps to the rifle. It fires in the small red circle.
READ INSTRUCTIONS. Also, you cant get a high score with easy mode and the hard and normal mode scores are seperate.