Here's trouble. You're transporting a spaceship load of friendly Tribbles and someone leaves open the door to their cells.

One by one the Tribbles leave and begin wandering through your craft whose workings, judging from the screen picture, were designed by Heath Robinson.

The aim of the game is to catch each Tribble before it reaches the cargo transporter and gets fizzled. You do this by moving a grille around the screen, trying to place it in the Tribble's path.

The silly creature doesn't follow a predictable route, but it's quite easy to outwit it until a 'Wafoid' and a 'service droid' appear. They steal the grille and generally cause havoc.

The action is accompanied by noisy sound effects, and there's a catchy tune to start you off.

But although the game is very different and quite enjoyable, there's basically just one screen of action, and I wonder how long interest would be maintained.