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When you buy one, take a good fucking look at it because you will NEVER (and I fucking mean EVER) see it like that again. 300,000,000 (three hundred million) have been sold worldwide since 1980 (100,000,000 from '80-'82), making it the best selling individual toy ever. David Singmaster and Alexander Frey developed a way to solve the puzzle in 25 moves (using computers). It is probably the only puzzle-toy that people have written books about (including the one written by a 12 year old boy that sold 1.5 million copies). Frank Morris holds the record for the fast solving: 15 seconds flat!
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