Roman Negativity [YYJ Pack]
(Published on 7. March 2026, 01:00 by yttrio)
This was originally created for the Yin Yang Journey puzzle pack. Links to previous puzzles in the pack are below:
Go Yin Yang
Through the Caverns
Sandwich Break
Staircase Serpent
Rules:
Normal Sudoku rules apply.
Yin Yang: Shade some cells such that all shaded cells are orthogonally connected, all unshaded cells are orthogonally connected, and no 2x2 area is fully shaded or fully unshaded.
Values separated by an X sum to 10. Values separated by a V sum to 5. Not all possible Xs and Vs are necessarily given.
Negative difference constraint: Orthogonally adjacent values cannot have a difference of 1.
Digits in shaded cells count as the negative of their value for the purposes of the XV and difference constraints.
6x6 Example:
The image below shows a sample 6x6 puzzle and solution with the same rule set.
Play the example in SudokuPad.
Solution code: Digits in shaded cells in row 8 (left to right)
Comments
on 8. March 2026, 19:30 by galium_odoratum
Very fun and with interesting interactions. Difficulty-wise I would say it is a 3*.
on 7. March 2026, 16:59 by balpha
Loved it! Really well constructed to make the constraints work together. Very fun to solve.
on 7. March 2026, 16:49 by Joyofrandomness
So fun! Thanks!
on 7. March 2026, 12:07 by Snookerfan
Great puzzle! I really liked how the negative constraint defined so much of the yin yang. Thanks
on 7. March 2026, 02:38 by GorgeousNicko
Lovely! I strongly recommend solving the 6x6 sampler first, before focusing on just what is different about the full-fat version.
