The Split Maze Burr is a unique reconfigurable puzzle. The configurations range from somewhat easy to grueling and tedius.
The tool to reconfigure this puzzle is hidden inside and you must complete the first configuration to continue onto harder ones.
I can provide the PDF of the configurations once you have the tool or with the puzzle. The first configuration is 31 moves to open. The hardest listed in the guide is 382 moves.... :X
I enjoyed this puzzle very much but need to make room for new puzzles coming in.