Bichromancy
(Published on 13. February 2026, 00:00 by NXTMaster)
This is a collaboration between Dylan Levine and myself with the goal of showcasing Dylan's "indexed yin-yang" constraint.
The rules are as follows:
The puzzle is available on SudokuPad. Have fun coloring!
The rules are as follows:
- Place the digits 1-9 once in every row and column.
- Indexed Yin-Yang: Color each cell one of two colors. All cells of the same color are orthogonally contiguous and no 2x2 area is made up of a single color. Digits in row 1 indicate how many times the column number appears in their color (e.g., a digit 9 on a red cell in row 1, column 5 indicates there are nine 5s in red cells).
- Cages: All cages must be entirely one color, but orthogonally adjacent cages must be different colors. Digits inside a cage cannot repeat and add to the small number in the top left corner if given.
The puzzle is available on SudokuPad. Have fun coloring!
Solution code: Row 6. Include a "-" to separate digits belonging to different colors.
Last changed on -
Solved by Justalilguy, Da Letter El, sacredgrass, Asphodel, PippoForte, lmdemasi, misko, Snookerfan
Comments
yesterday, 16:11 by Snookerfan
Fabulous puzzle! Extremely hard, but so rewarding! Thanks
Last changed on 13. February 2026, 03:27
on 13. February 2026, 03:27 by Justalilguy
An incredible puzzle with several cool hidden deductions associated with the indexing rule. Absolute banger!
