The Climburr is maybe one of the most difficult interlocking puzzles of 3 pieces in a 5x5x5 frame you can get, and it is a good one! It features sliding moves and rotations, and is fun to play with. To avoid simpler solutions, the design has some complicated angled cuts, and Mat has crafted those in the same high standard like the rest of the puzzle. If looks beautiful and has precise fit. Ordering and shipping were easy and good service without issues. Thanks a lot!