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Japanese Tenyo Co. Ltd. Pla-Puzzle Number 24... apparently one of the world's hardest puzzles (at least in the Pla-Puzzle series). Also known as a Septiamond, there are over 100,000 combinations in these 24 little annoying pieces, making this brain teaser harder than Chinese algebra. The original sticker on the front says, "Computer Puzzle in Computer Age". LMAO. More jovial quotes from the back include:
• "You will be a genius if you can find a way to fit all pieces into case within an hour, but not a fool if you can not in a day."
• "If you succeed with a perfect combination to fit into the case take it memo and to find other ones."
Condition: Probably unused. Some slight cracking to the plastic lid case on the edge. For the photos below I dared not take the pieces out of the box - for fear of never being able to put them back together again. Measures 4½ inches by ½ inch.