The Haselgrove Box is named after the British inventor of the puzzle, Jennifer Haselgrove. You will notice the main piece reads as an H from above and a J from the side.
The puzzle is based on the locking mechanism of the Egyptian pyramids and the aim is to remove all the pieces. This would seem simple but there are a series of moves you have to perform to release the locking mechanism and you have to solve this essentially blind.
An interesting puzzle that is fairly hard to solve.
Comes with instructions. Puzzle measures 89x83x83mm.
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