Superstition
Normal sudoku rules apply. Any two digits which sum to thirteen can never be touching, not even diagonally.
Solution code: rows 1 and 7
on 12. November 2023, 16:50 by Geb
The pattern this produces is well worth the effort to deduce it!
on 18. February 2023, 11:15 by molaeiali
A bit difficult in the end, but it was unique
on 26. August 2022, 11:07 by MartinR
Nice interactions, I'm a fan of negative constraints:)
on 23. August 2022, 20:59 by britboy3456
Cool gimmick, particularly enjoyed the early-game deductions!