Shoot down the attacking UFOs and to save the city
F.S.A. (Flying Saucers Attack) aka F.U.G.A. (Fliegende Untertassen greifen an) is a kind of mixture between two old Atari2600 games. It comes in German and English language. You'll see a screen with your city that you have to save against 30 Alien attack waves in three different difficulty levels. You shoot attacking UFOs with two cannons positioned at the left and right borders of the screen. The UFOs will first bomb away all your buildings then send in little green men to dig tunnels to blow your cannons which results in a game over.