Can always up the twixt difficulty by adding conditional patterns[8][9]. Bit easier than designing a unique rubix cube.

Battle of the 2d tiling concept[0][2]; but a VR 3d would require additional foor/ceiling perspective.

Although really depends on how one define's an 8x8 chess board relative to what's considered twisty. ( lambda calc, fourier transform, turing complete spreadsheet, etc. )[3][4], execution / code path [5], language garbage collection[6].

[0] : https://tilings.math.uni-bielefeld.de/

[1] : https://boardgamegeek.com/boardgame/949/twixt

[2] : https://news.ycombinator.com/item?id=35273707

[3] : https://tromp.github.io/ ; acute squares : https://www.ics.uci.edu/~eppstein/junkyard/acute-square/

[4] : https://esolangs.org/wiki/Main_Page

[5] : https://www.dangermouse.net/esoteric/piet.html

[7] : https://gchandbook.org/index.html

[8] : https://www.ics.uci.edu/~eppstein/junkyard/all.html

[9] : https://www.chiark.greenend.org.uk/~sgtatham/puzzles/js/loop...