50 Antiking (50mathSWU)
(Published on 14. July 2026, 13:20 by ivaylagergova)
Normal Sudoku rules apply.
Antiking: Cells a king's move apart (touching diagonally) cannot contain the same digit.
SQUARES = even digits.
CIRCLES = odd digits.
X between two orthogonally adjacent cells = sum 10.
V between two orthogonally adjacent cells = sum 5.
Created by Ivayla Gergova for the Sudoku Competition celebrating 50 Years of Mathematics at South-West University "Neofit Rilski" in Blagoevgrad, Bulgaria.
Play online in SudokuPad.
Solution code: Row 9
Comments
on 15. July 2026, 23:52 by macintux
Much easier once you remember the negative constraint. Oops.
on 14. July 2026, 15:52 by VeTaurus
Very nice but definitely a 1-star-puzzle.
on 14. July 2026, 15:03 by superkinkel
Nice one, but I think it's rather a single star difficulty.
on 14. July 2026, 14:26 by ivaylagergova
Edited rules
on 14. July 2026, 13:33 by lars
The rule about all X and V clues being given, is not clear, as the given 1 and 9 don't have an X between them.
Edit: I now also noticed this isn't true for non-given digits.
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Thank you! The rules were correct in SudokuPad but not here. All fixed!
