This is a version of the famous 'Mastermind' game, best translated on an Organiser II XP, (XTRAN on LZ.)
It may be modified to display on an LZ, but it seemed wise to keep it equally usable on all Organisers.

The four procedures it depends on may have other uses. For this reason they were kept separate instead of
editing them permanently into the FindCode.opl file.

Playing the game is probably easier than reading the rule book, so there isn't one...

Solving the code is less easy, but Donald Knuth gives clues to solving in five tries. It works for me.

There is a JavaScript version of this same code at http://lostgallifreyan.net
