Hanayama cast puzzles are the world's finest brain teasers. The keyhole is a high-quality, cast metal puzzle that is mensa-level rated difficulty. The theme is "groove" Which was devised by Finnish VESA timonen.

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Hanayama cast puzzles are the world's finest brain teasers. The keyhole is a high-quality, cast metal puzzle that is mensa-level rated difficulty. The theme is "groove" Which was devised by Finnish VESA timonen.

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