This is with the hypercube, or sudoku6, constraints, i.e., 6 regions per cell.
.............E.. .......G........ ...............1 ..C.........4... ................ ................ ................ ................ ..6.GD.......... .........E...... ..............7. ...........7.... ....3......F.8.. .....B....8...A. ........9....... ..............26 20 clues 30 hours(!) to generate 44 minutes to solve(!)
Removing any clue destroys the uniqueness of the solution.
unique solution: A5GD8147C936FEB2 1478EFDG5A2B9C63 3BE962AC78F4DG51 26CFB395GD1E478A 4F839C2E1B756ADG C952A834F6GDB1E7 GD1657BFE3CA2498 7EABDG61824935FC E761GDFB24A853C9 DGBA75163E9C824F FC254983B1DGA67E 9834CAE26F571BGD B29C365ADGEF7814 63FE2BC94781GDA5 8A471EGD9562CF3B 51DGF478ACB3E926
Another one
......7...B..... .....9.......... ........3....... ................ ...............6 .......4........ ......G.......DF .1.............. ..6..........E.. .....G......21F. C...........A... .............C.. ................ ................ ......5......... .....4.......... A5E3GC7F6DB98412 4FG1E9A5C287B36D 9B28D1463EFA57CG 76DC283B1G54FA9E B7FD5291EA48CG36 3C52FDB4961G78EA 64AE83GC257B19DF G189AE67DFC34B25 196G4B8AF32CDE57 8A7B6GC354DE21F9 CD357FE2G891A6B4 E24F951DB7A63CG8 28C436DE71G59FAB DE961728AB3FG54C FG17BA594C6DE283 53BAC4FG89E26D71 21 clues 64 hours to generate 100 minutes to solve
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