Enigma is a new type of computer game. In most games you have a set of rules. In these games it is the other way round. The game will be over when you discover the rule by which it is being played. The computer will accept or reject cards - your objective is to discover the rules. There are five rules in all - but don't be discouraged - the games can be solved - if you have enough imagination and perseverance.

When you've solved all five enigmas, return the cassette with £4.00 and we'll send you another five by return.