From the back of the box It is waiting for you, daring you by it's very presence. Built by an alien race that rules the galaxy, It's tunnels and complexes plunge deep into the radioactive rock and extend all the way to the complex hovering hundreds of miles above the planet. Once barren of life, the Eternals have made it into a living hell: the planet Tempest. Mission on Thunderhead contains over fifty rooms and four mazes. One hundred variations combined with nine skill levels make each game a different challenge.