Move the shield with your mouse to protect the city from meteors. As time goes by, the number of meteors and their speed increases. You can collect power ups and gain: bigger shield, destroy all meteors on screen, life, slow down the meteors, decrease the number of meteors. If you get hit by black box you can: get invisible for some time, increase the number of meteors, increase the speed of the meteors, get smaller and loose a life. The goal is to defend the city as longer you can.