Octoquadri Quad
(Published on 13. July 2025, 14:38 by TripleABattery)
I had previously uploaded these as four separate Octoquadri puzzles, but despite my rigorous testing, it was pointed out to me that one of them (the Top/Red grid) wasn't unique. After trying out a few ways to fix this, I ended up keeping it as it was but having the four grids overlap, which I also asked DiMono to test just to make sure everything works now (Thank you very much DiMono!). I apologise to those who were frustrated by the previous version and I hope you enjoy the new and improved version :)
Octoquadri QuadEach of the four 4x4 grids are Octoquadri puzzles, which overlap each-other in the inner corners. In each Octoquadri puzzle, place 8 of the digits from 1-9 exactly twice each, such that no digit repeats within any row, column or 2x2 square.
In the Left/Blue and Bottom/Green grid, digits within the grid may not repeat a King's or Knight's move apart.
Additionally, the following rules apply throughout all four grids:
Box borders divide blue lines into segments with the same sum. (note that for the Right/Purple grid, the box borders of the Top/Red and Bottom/Green grid do not affect this!)
Along green lines, adjacent digits must have a difference of at least 5 and all digits must be from a different ten-sum subset (i.e. one from {1,9}, {2,8}, {3,7}, and {4,6} each).
Black dots separate digits where one is double the other. White dots separate consecutive digits.
Digits separated by a V sum to 5. Digits separated by an X sum to 10.
Not all dots, Vs, and Xs are necessarily given.
Solution code: The digits in row 2 (from left to right), followed by the missing digit of each Octoquadri, starting with the Top/Red puzzle and moving counter-clockwise.
Comments
on 15. July 2025, 19:28 by TVDK
I was surprised at how low the rating was after solving it. I thoroughly enjoyed the different logic required for each grid. While it did make me think, I disagree with the 3* difficulty has (edit: it went down to 2* after my rating lol).
On the conflict checker, sudokupad automatically applies anti-king/knight checking when it is mentioned in the rules. An option would be to just disable conflict checking for the link
(e.g. https://sudokupad.app/ff2flgpk76?setting-conflictchecker=0)
on 14. July 2025, 11:56 by Gribba Bibba
Playing in sudokupad, the automatic conflict checker applies the anti-king's rule to the entire puzzle, making the correct solution seem incorrect.
