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Your task is to protect Zeta Class Defence Sphere 7, which is essentially a blue planet hanging in deepest space.

You're armed with a 'solar-powered Positron Accelerator'. Sounds impressive. Well, it isn't. It's just a set of sights which you rotate in search of enemy attackers. Despite all that positron acceleration it's about as powerful as a rusty old cannon.

Press the fire-button and your pod lobs out a ball which flickers lazily towards its target. By the time your cannon-ball explodes any self- respecting alien is likely to be long gone.

Below the space display is a status board giving you information on your pod's condition: 'Yellow' means you have to find time to re-charge your power and 'Red' means you are in danger of imminent destruction.

Attackers come in the shape of fighters, saucers and larger flagships. They're all devious and hard to hit.

The graphics are good but nothing special and the scrolling is slightly jerky. Zeta 7 can make for an entertaining half-hour - a bit like watching an old episode of Star Trek.