Dodge waves of kamikaze turtles and blast packs of sluggish snails in this latest clone of the well-worn Space Invaders theme.

As in all invader-style games, your laser base is under attack from waves of mutants, in the case of Multitron, they take the shape of dive bombing tortoises, several winged phoenix and small snail-like creatures amongst others.

One very interesting feature in the game is that once you have managed to survive all six waves of mutants you have to manoeuvre your laser base through a vertically scrolling tunnel to reach the next stage of the game. If you run out of control and hit the side of the winding tunnel, you will encounter an anti-matter field and immediately be blasted into a million little pieces.

Continual use of your laser will soon use up the energy available on each level and I found it best to conserve energy by firing in short bursts. Your energy cells will regenerate themselves if you don't fire for a couple of seconds, but it is very irritating having to hang around and dodge the enemy missiles with no way of retaliating.

A very ordinary game to play in its initial stages but it is redeemed by the space corridor and the fast action waiting for you on the other side.

Multitron runs on the unexpanded Vic-20 and incorporates hi-res graphics. Good use has been made of the limited memory. The game is controlled by either keyboard or joystick and is available from Manchester-based Sumlock at £7.95.