I really am being spoilt this time. Another hi-res game to review, and a very good one too. It is the traditional invaders-type game, but the graphics are excellent.

The game can be played with either one or two players, and you have five lives per game. The action seemed a little slow at the start of the game, but it speeds up as you progress. The motherships are particularly difficult to hit as they dart across the top of the screen. The only time I successfully destroyed one was whilst it was stationary dropping off an alien to reinforce the attack on my defences. There are five aliens worth from 10 up to 50 points each. Motherships are a good catch, earning you 700 or more points.

As I have already indicated, the graphics display is very good indeed. Not only are the aliens nicely designed but the movement and explosions are good too. Your defender laser even recoils at each firing burst to good effect.

ZOR is an excellent program and must rank very highly in the ZX81 hall of fame.