Once loaded, the game presents you with an irregularly shaped grid divided into squares. The object of the game is to steer your ship around the squares to colour them in and score points. There is a snag - an alien lurks on the grid and will give chase once he sees you, but if you are cunning you can lose him. One you fill in a grid, a different-shaped one is presented: and if you are very good, two aliens are eventually present - an almost impossible problem.

This game uses simple but adequate graphics. And although the concept is relatively unsophisticated, skill levels increase steadily through the game so your interest is maintained. One criticism is the absence of instructions on the cassette box; they are provided on the screen during loading, which results in a long and cumbersome loading procedure.