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Classed as an educational program for ages five to fourteen, this is a highly entertaining game for a much wider age group. You choose from four racing cars, from formula one to the slower formula four. Next you have a choice from six mathematical operations, ranging from addition, to multiplication and division in the same sum.

You can then either go for a practice run, or enter the full rally. On the practice run you have a choice of the road conditions, including oil slicks, rocks on the track, and night driving.

Once in the rally, you are in one of four lanes, each with a sum in it. Underneath the tracks are the numbers are the numbers which go to make up the sum; these are in the form x + y, according to your earlier choice. You steer your car to the lane with the number nearest to the sum shown, hence the term estimator in the title.

Speed is under your control, with a constant showing of time lapsed, and distance, in kilometres, travelled. Every half kilometre a warning sounds, if you are not in the correct lane disaster befalls you.

An excellent game, excellent programming.

B.B.