Quzzle was based on a classic sliding block puzzle known as "Dad's" puzzle. The objective is the move the large piece from one specific corner to another specific corner (a different corner than Quzzle and a different configuration of pieces). Dad's puzzle is not easy but it is much easier than Quzzle. The name "Dad's" puzzle supposedly reflects the task of the head of the family rearranging pieces of furniture. The large block represents a grand piano, to be moved to a specific corner of the room. No doubt Dad's puzzle was invented by a mechanical tinkerer who tried many combinations randomly, stopping when he found a "rather" difficult combination. Little could the creator imagine that a century later every possible puzzle of the type would be scrutinized by a high speed electronic brain - work that could take years to do manually.