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A 3x3x3 that only allows 180-degree turns.
This puzzle, designed by Oskar van Deventer, was contrived by Takafumi Haseda and first prototyped by Hidetoshi Takeji in 2007 under the name "HANZOH". It's mechanism allows only half turns. In image #2 no sides can be turned except the green. This makes it a different puzzle that is easier to solve than a regular 3x3x3.
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Thank you to the following people for their assistance in helping collect the information on this page: Oskar, katsmom, beeedy, sausage.
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