Pretty nice, satisfying tactile manipulation of puzzle boxes. It has like 25 different boxes, I think, depending on what you count as a box. Sticks to what you're looking for from the game.
The puzzles are usually more just figuring out what you're trying to do, only a couple of them are really puzzles you have to think about.
Probably not worth 15 bucks, but kind of a nice relaxing use of time.