Parity Party
(Published on 21. January 2026, 16:46 by Chilly)
The Rules:
- Normal irregular Sudoku rules apply.
- Chaos construction: regions are to be determined, and must consist of a set of nine orthogonally connected cells, containing the digits 1-9 exactly once each.
- Dead ends: a cell containing a blue square is a dead end - a dead end in a region is a cell that is attached orthogonally to only one other cell in its region.
- Open ends: a cell containing an orange circle is an open end - an open end in a region is a cell that is attached orthogonally to more than two other cells in its region.
- Digits in a cell with an orange shape must be odd, and digits in a cell with a blue shape must be even.
- A digit in a cell with a small green circle counts the number of digits having the same parity (odd, even) as itself in the surrounding 3x3 area, including itself.
Parity Party
by Chilly
Solution code: All digits and borders in row 5. Where there is a border separating two digits insert a '-' (not including grid edges). For example, if the digits were 123456789, and there were two borders in total, one between 3 and 4 and another between 7 and 8, then the code would be 123-4567-89.
Comments
on 31. January 2026, 13:07 by kmoter
thanks for puzzle, solid cc, 3/4 difficulty, when one grasp how the circle/square works in the grid
on 22. January 2026, 14:13 by marcmees
Got some issues with the region containing the circled 9, but when I finally discovered I ommited a possibility, it solved nicely. Thanks for this beauty.
on 22. January 2026, 00:06 by bansalsaab
Breakin was brutal but once the regions start building it was really fun.
