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Invisible Man is a sort of educational Battleships for eight to 13-year-olds. When you run the game a 10 by 15 grid is displayed and then disappears. Somewhere in the 150 squares on the screen an invisible man is hiding and the aim is to expose him to view by guessing which squares he is hiding under.

The kids enter this into the Electron using a simple co-ordinate system. If they miss with their shot the micro responds with a hint, using the points of the compass. This makes it much of a game of chance than Battleships and allows the children to use and expand their knowledge of simple co-ordinates and compass directions.

The idea is to find the man in fewer tries than your rivals. The whole thing is well explained, simple to use and extremely idiot-proof. It's also a pleasant game in its own right. The only quibble is that it might have been better if the lines of the grid were left on the screen rather than disappearing when the man hides. This, I am sure, would enhance an already useful program.

Peter Gray