Cavern claustrophobia strikes in this Scramble-type game of horizontally scrolling tunnels.

Your job is to notch up the points by blasting the aliens with lasers and bombs. The latter are fired with the space bar - a tricky manoeuvre whether you're using keys or a joystick.

The rocky corridors are identified by colour. The first stage is in orange. Buildings, fuel dumps, radar stations and nuclear bases appear on the cavern floor. You speed through zapping and bombing - but don't hit the nuclear power stations or you'll be destroyed in the atomic explosion!

You also have to dodge or blast the enemy rockets. These take off vertically but then change trajectory, swerving left towards you. They're easy to avoid but that's not the last of your problems.

Your engines guzzle fuel like it's going out of fashion. The usual Scramble-d logic applies here - you take on supplies by destroying the enemy fuel dumps. Failing this your ship does a graceful nose dive into the scenery.

In the later screens, you face a more varied assortment of attackers with obligingly suicidal guided missiles in the second (green) section and mine layers in the third (blue). The missiles lock on - and fly straight into your laser fire; the mine layers drop streams of floating bombs, a much harder wave - even though they look like snowflakes.

The tunnel is rather crudely drawn and the scrolling is jerky but the craft and aliens look good. Memotech owners who like a good Scramble will find plenty of tough action here.