Another debut product from a foreign software company, which has recruited some of the best programmers, artists and musicians from Germany, Poland, Austria and Sweden. Or at least that's what they tell us (and they would, wouldn't they?).

Once in a while, a game will emerge with a mind-blowingly simple concept, which turns out to be fiendishly playable and hopelessly addictive. Mystery fits right into this category. The game is very simple indeed, and is played on an 18 x 7 grid of squares. You, the Knight, start on one side of the grid and your opponent, the Wizard, starts on the opposite side.

Each player is allowed to move to any adjacent square per turn, and then 'erase' any square from the grid. Then the other player performs much the same action. The aim of the game is to 'surround' the other player with blank squares, in order to prevent your opponent from moving. Is that a simple enough concept for you? [Er, no, could you run that by me again? - Ed]

Mystery is a classic among puzzle games; it takes a minute to learn the rules, but each game is a new and different challenge. The only drawback to this potentially perfect piece of software is the lack of a computer-controlled player - to derive any sort of lasting entertainment you'll need to enlist the help of a joystick-wielding companion.

The graphics are pleasant enough, the music mellow and relaxing, but be prepared for some compelling, infuriating and rather long sessions in front of your C64.