How to play They came from the Skies on Mac

In the 1960s an aggressive alien species attempts to invade Planet Earth. It is your duty to prevent the annihilation of the human race. They Came From the Skies is an arcade 3D shoot-'em-up where the player can choose between two different look alike aircrafts of that decade - a jet fighter and a bomber. In the following 20 missions the main task is to keep control of the sky by fighting flying saucers and defeating mother ships. - Twenty huge and varied missions with hordes of enemies to destroy - Fly fighter jets, attack bombers and captured alien flying saucers - Manage aircraft upgrades and repairs to gain the upper hand - Destroy alien mother ships, flying saucers, drop ships and infected human military hardware!