A variant of Asteroids, in which you fend off the asteroids while trying to shoot the enemy fleet.
An asteroid is worth 100 points, a hit on the outer wing of an enemy ship gets you 100 p<5ints, but you score 500 for a direct hit.
As in the arcade version, you rotate your ship, and you are armed witrreight lasers - one for each direction. But objects hitting your ship gradually whittle down your lasers; active lasers are shown at the bottom of the screen.
The game is for one player, and control is via the keyboard. Seven skill levels are accompanied by a funny remark. Selection of skill level is immediately followed by automatic launching and display of instructions.
No colour, since the highest resolution is used, and no sound either - but that might prove too much of a distraction anyway.
For if anything, the game is rather too fast, and it's practically impossible to avoid damage to your ship. The best tactic is just to rotate constantly in one direction, firing all the while. This makes for rather a mindless, but nonetheless enjoyable game.