Place nine non-overlapping 3x3 regions into the grid and fill them with the digits 1-9. Digits in regions may not repeat in any row, column, or region, but digits may repeat outside the regions (i.e. digits outside regions are "invisible").
Solution code: row 9
on 29. September 2023, 15:06 by h5663454
Pure deconstructed Sudoku…
Huh...this is quite interesting.
on 27. September 2023, 23:03 by Twan2797
Very nice. Thank you for setting