Your wits need to be as sharp as your reflexes when playing UFO. To save your city from certain destruction alien spacecraft must be shot from the skies.

The problem is that except for a few fleeting moments, the UFOs are invisible, so their exact position must be committed to memory.

Your fighter travels across the screen. When you think the fighter is directly beneath a UFO you open fire with your lasers.

Failing to annihilate the alien causes part of your city to be destroyed, the game ending should your city become totally obliterated.

Your own spaceship has limited resources: when fuel and laser energy need replenishing, it must be landed at the refuelling base.

Failing to refuel or making a crash landing brings the game to an end, whereupon the highest score is given.

There are three skill levels. At the easiest level there is only one UFO; at the next there is also a decoy, and at the third, two decoys.

The game is great fun and addictive to play. My only criticism is that the position of the UFOs hasn't been randomized, so after several runs you can easily remember where they are.

J.W.