In the 2025 competition, Tortoise Protocol was runner-up for the Puzzlers’ Award, which is determined by attendees who vote for their favorite. The year before, another of Mr. Yananose’s creature ...

[Kagen Sound] is a woodworker and artist who gives a great behind-the-scenes look at his amazingly high-quality puzzle boxes (video). Not only do his varied puzzle box designs show his math background ...