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A threatening alien flagship hovers above you, and the aim of the game is to destroy it. But to fire at it you must first blast holes in the force field. To hinder you, alien bomb ships flap across the screen above the force field, firing rapidly. The force field plays strange tricks, turning one of your missiles in-to three missiles falling towards you.

If these hazards can be avoided and the flag ship destroyed by hitting a central control point (which flashes blue and white) then your score is boosted, according to how long it took you, and a warning of superior aliens is given. If your time runs out, or if you lose all of your three lives, then the game is over.

There are two levels of play, standard or suicidal - in the second level, the game rarely lasts more than a few seconds! The graphics are colourful and, to add a nice twist, when you have been hit a little Artic lorry trundles on to repair your base.

The instruction sequence is long and complex, although the game is largely self-explanatory. Invasion Force is simple but addictive, and makes a change from the usual 'Bang-Bang, kill the aliens' format.