Yet another version of Defender, but not a particularly good example. Various types of alien move in from the right hand side of the screen over a rather crude, mountainous terrain. You manoeuvre your spaceship, shooting at the approaching aliens, and that's about all there is to it. The graphics are a little jerky and the game is very noisy (thank heavens for the volume control knob); one nice feature, however, is that the game steadily increases in difficulty (the number and speed of the aliens) so that a newcomer can enjoy it as much as a more experienced player.