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The world first fully functional 5x6x6 cuboid.
The inventor made this puzzle out of a mass-produced 6x6x6. Although the cubies on this puzzle are proportional, the inventor could not find a way to have no gaps between them, like on conventional proportional cuboids.
In 2018 Traiphum Pruntaengkit came up with his version that has no gaps but unproportional pieces. See images 4-5.
Size: 67 x 78 x 78 mm
Thank you to the following people for their assistance in helping collect the information on this page: Ilya Toporgilka, quisquidillius.
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