With software like this, it's a shame the Memotech isn't a more popular machine because this is a high quality program based on Buck Rogers And The Planet of Zoom.

The game has you skimming low over a planet surface which scrolls towards you in 3D. Each stage of your journey presents you with a new alien threat and a time limit to deal with it.

The first stage gives you six gates to pass through and, once this is achieved, eight aliens will start bouncing down the screen towards you to be blasted.

If you survive this, you move to a roadway with the occasional bridge over it and a new type of craft which hangs in the distance and then zooms towards you. Next up is a tunnel with fighters zipping down it. Both these stages are easy to survive though if you just maintain position in the centre of the screen and keep firing.

The following section is a different matter with a changing perspective and some very mean alien ships doing their utmost to turn you into tunnel pebble-dashing.

The backgrounds and tunnels are certainly colourful but there are one or two nasty clashes and character overlaps.

Your ship has a limited ability to change height but this is only over a small area of the bottom of the screen and the craft always maintains the same flight attitude.

There were one or two slight niggles about the game because it's hard to judge your firing position accurately and too much of the action is left to chance rather than skill. These don't spoil the game though and it will be a welcome addition to any Memotech owner's spartan collection.

Just about the best shoot-'em-up I've seen on the Memotech. The 3D effects are very good, although I found the purple and blue lines on the first screen a trifle wearing on the eyes.

Later screens are progressively more difficult. Things got tough for me down in the trench - whatever those aliens are, they're pretty elusive.

Although this game is obviously just a Buck Rogers clone, it gave me some good old-fashioned 3D fun.

What I found particularly annoying throughout this game was the fact that you couldn't judge how near to the ground the nasties were. This wouldn't have been too bad if you didn't have to kill them or blast them out of your way, but after missing a couple and then being destroyed twice, I began to get the feeling that it wasn't my day.

All the screens are very colourful, but the problem with this is that once I'd adjusted my eyes to it, I spent five minutes staggering blind around the office before normality returned. Despite this, the game was good fun to play with great sound effects.