Flash! Bang! Whallop! What a picture! You are the Zone Gunner protecting the Laserzone from attack by those ever present Aliens, your only defence being two plasma cannons which move along the horizontal and vertical axis. You can also fire diagonally, but this is a tricky skill to perfect.

A training mode is thoughtfully provided; I strongly advise you to use it before getting into the main game. Controlling your Plasma Cannon properly is a real art!

The black background may cause a lack of definition on some TV sets but the graphic complexity as the game hots up is brilliant; Aliens and Plasma bolts and space debris go flying all over the show, great! The sonics too are just right, having the sinister metallic sound that only Llamasoft seems to be able to reproduce. This is what your 16K RAM is for. 31 levels of difficulty? I can't cope.