You know that feeling, right? The rush of conquering a tough raid, or the pure joy of finally beating that nightmarish level.

Frankie thought his daughter would be learning all the different shape names, but told Newsweek he quickly realized that was not the case.

Not only do his varied puzzle box designs show his math background, but they are all made entirely of wood. There are no nails or fasteners; just intricately-fitted wood and some glue. There’s a ...