Yin Yang Doubler Uniqueness
(Published on 3. April 2026, 19:22 by Oddlyeven)
Rules: Normal Sudoku rules apply. Put the digits 1 to 9 once each into every row, column and box.
Yin Yang Doublers: Shade some cells in the grid such that all shaded cells are orthoganally connected and all unshaded cells are orthogonally connected. No 2x2 may be all shaded or all unshaded. A shaded cell has a value equal to twice its digit. An unshaded cell has a value equal to twice its digit minus one (double the digit first, then subtract one).
Uniqueness: On each of the constraints below, values do not repeat anywhere in the puzzle. For example, if there is a shaded 5 (value 10) on a renban, shaded 5 can't appear anywhere else on a renban, but unshaded 5 could because it has a value of 9.
Renban: Values on a purple line form a set of consecutive numbers with no repeats.
Arrows: Values along an arrow sum the value in that arrow's circle.
X: Two cells joined by an X have values that sum to 10.
Black Dots: Two cells joined by a black dot have values where one is double the other.
Links:
SudokuPad: https://sudokupad.app/yl0n45rfll
Solution code: Column 8, top to bottom (9 digits).
Comments
on 5. June 2026, 15:10 by daggerMason
A cut above. Thank you!
on 16. May 2026, 21:35 by Djirt
Спасибо, потрясающая логика! Очень понравилось!)
on 4. May 2026, 19:32 by GWilliams00
Fantastic puzzle, one of my favorites in recent memory! The break-in taught me what I needed to know to make the rest of the solve super smooth. I found the ruleset quite intuitive, after taking a moment at the beginning to internalize what values a digit could have given its shading.
on 4. May 2026, 01:55 by Ragna
That ruleset is VERY confusing! ;-)
on 20. April 2026, 03:54 by Agent
Great puzzle, very precise solution path!
on 20. April 2026, 01:44 by ViKingPrime
You've got to stop pulling stunts like this, you're going to give someone a brain injury.
on 9. April 2026, 11:35 by mercierus
Very nice, I made the same mistake twice on the double arrow thinking there was only one way of doing it and once I realized it, it became a smooth solve. Thank you for this puzzle!
on 5. April 2026, 02:43 by polcat
Incredible puzzle! Thank you
on 4. April 2026, 05:30 by rameshsrivats
Mindbendingly magnificent
on 4. April 2026, 03:57 by Crusader175
Really nice construction!
on 3. April 2026, 23:49 by wuc
63 very joyful minutes. Awesome setting thx.
on 3. April 2026, 21:38 by Douglass
Majestic puzzle
on 3. April 2026, 19:32 by Nurator
Mind bending fun!
on 3. April 2026, 19:29 by Manta-Ray
Lots of very interesting logic, great puzzle!
