Code Maker/Code Breaker

Twin pack of games from Creative Software:

* Code Maker is a Mastermind variant where you have a set number of guesses to crack a computer generated code, given some clues to identify the correct colours (represented by letters in this version) and their positioning in the code, based on your previous guesses.

* Code Breaker sees you turn the tables on the VIC-20 itself by allowing you to set the code and watch as the computer struggles to work out the correct sequence itself.

There's a reaonable argument to be made that the game titles were accidentally swapped (as Code Breaker seems a more apt title for the game where you're trying to break someone's else code and Code Maker is more reflective of a game where you need to set the code yourself - this isn't confirmed anywhere though!)