Twinned X-Sum Chaos
(Published on 20. August 2026, 15:53 by Oddlyeven)
Rules: In each of the two grids, place the digits 1 to 6 once each into every row column and region. The regions are orthogonally connected groups of six cells that must be determined by the solver.
Twinned X-Sums: A clue outside a grid gives the sum of the first X digits seen by the clue, where X is the digit in the other grid that is in the same relative position as the cell next to the clue. For example, if the top grid had a 6 clue to the left of row 4, and R4C1 was a 2 in the bottom grid, then in the top grid, R4C1 and R4C2 would sum to 6. All cells in a sum are in the same region. The cell immediately after a sum is in a different region. Clues between the two grids apply to both grids.
Links:
SudokuPad: https://sudokupad.app/dsxzcutemw
Solution code: Row 4 of the top grid, left to right, and Row 4 of the bottom grid, left to right (12 digits).
Comments
on 26. August 2026, 11:36 by amirs
Beautiful!
on 25. August 2026, 00:11 by Kattorzeh
Absolutely brilliant, fantastic!
on 24. August 2026, 21:00 by yuripuppies
Took me a hot minute to understand the constraints but once it clicked it was incredibly satisfying and every digit felt hard earned but not impossible
on 21. August 2026, 09:30 by damo_89
Excellent and mind bending.
on 21. August 2026, 08:12 by Christounet
Very nice twist on X-sums! Thanks :)
on 21. August 2026, 03:52 by KeenanN
This puzzle was a true delight! I have added to my favorites. The flow of the solve is incredible and every step is very rewarding. Thanks :)
on 21. August 2026, 02:28 by Deckatron
This was my favorite puzzle in quite some time. The balance between the two puzzles-having to solve in parallel-was a lot of fun
on 20. August 2026, 21:03 by wuc
Lots of fun. A bit small on smartphone but it was so clever that it was worth the tiny adventure.
on 20. August 2026, 19:20 by Snookerfan
Brilliant puzzle with some amazing and original deductions that made me very happy! Thanks
on 20. August 2026, 18:17 by flutchman
Stunning construction. Very satisfying!
on 20. August 2026, 18:12 by ShuffBeeeell
Once you have a good grip on tracking the X-Sum clues, it's a smooth ride through. Very fun, well done!
