Years ago, it was a 'proven fact' that there could be no twisty cube made with sides greater than 5x5. Fortunately, Mr. Verdes from Greece never saw that proof and he designed the 6x6, 7x7, 8x8, 9x9 and 10x10.
3 years ago Oskar van Deventer designed the 17x17 cube, which he premiered at the annual New York Puzzle Party.
Check out this video of how a 13 x13 works
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