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Last month we had a puzzle about identifying one of 12 coins that might be conterfeit, all of the coins being of the same denomination and the same weight except if there is a conterfeit coin it is either lighter or heavier. The suggestion was that we would print a program from a reader, if such was offered. We did get a response from Donald Lambert (ZXir QLive Alive!) with an explanation of how he would determine the answer, but not a program. So, here is the program as given in the book. Brain Games for Kids & Adults for Apple II. As this is in GWBASIC, I will attempt to convert it to Sinclair BASIC for next month.