Dustpan (Disjoint parity sweeper sudoku)
(Published on 23. February 2023, 13:00 by Qodec)
- Sudoku: Each row, column, and region indicated by thick borders in the grid must contain the digits 1 to 9 once each.
- Parity sweeper: Cells marked with a circle show the number of digits with their same parity in their 3x3 neighborhood (including the digit in the cell). (E.g. if r1c1 is a 4, then all 4 cells in the r12c12 block are even. If r1c1 is a 1, 1 of those four cells is odd, which is r1c1, and so all three cells surrounding it must be even.) Not all circles are necessarily given.
- Disjoint groups: Digits cannot appear in the same relative position within different box regions. (E.g. r1c1 and r4c4 cannot contain the same digit.)
You can play this puzzle online using:
- CTC app (Sudokupad): https://tinyurl.com/y8m6v2af
- f-puzzles: https://f-puzzles.com/?id=2zhe7wcu
Solution code: Row 8. I.e. the 9 digits in row 8 from left to right, for example: 123456789
Comments
on 18. April 2023, 01:27 by SHERAX
Amazing! WoW!
on 27. February 2023, 22:21 by alanb
Very satisfying solve, the disjoint constraint slowly inches you to the solution like so many breadcrumbs. Really lovely flavor combination with the parity sweeper.
on 27. February 2023, 03:17 by antiknight
A beautiful idea!
on 27. February 2023, 00:11 by Godrick
Wow! The opening logic is beautiful and amazing! I'm still amazed that it had a unique (and findable) path from there. Thanks!
on 25. February 2023, 10:14 by ademjaz
Excellent puzzle, lots of fun!
on 24. February 2023, 22:03 by Playmaker6174
Lots of fun and enjoyment! The disjoint scanning clearly slowed me for a long while, but really I should've looked for obvious spots much better in here :P
on 24. February 2023, 16:15 by cam
These two rulesets marry together so well. It was a wonderful solve. Not easy, but not needlessly frustrating either--as the disjoint groups puzzles can sometimes be.
on 24. February 2023, 11:11 by abed hawila
Wonderful puzzle!
on 24. February 2023, 08:47 by GarageDoorOpener
This puzzle took me almost 2 hours but I had lots of fun doing it
on 24. February 2023, 02:04 by Calvinball
I typically don't enjoy disjoint sets, but a puzzle this fun and clever is always going to be an exception to that.
Thanks for taking your time to set this!
on 23. February 2023, 23:37 by Zombie Hunter
Very nice use of Disjoint. Wonderful puzzle.
on 23. February 2023, 23:05 by Phistomefel
That was fun! Thank you, Qodec! :)
on 23. February 2023, 22:27 by Zombie Hunter
Very nice use of Disjoint. Wonderful puzzle.
on 23. February 2023, 21:09 by Snookerfan
Very nice puzzle! Thank you
on 23. February 2023, 19:31 by Andrewsarchus
Great use of the Disjoint constraint!
on 23. February 2023, 19:26 by Piatato
Fascinating puzzle! I enjoyed gradually unraveling everything and luckily the discount groups weren't too hard on me. :)
on 23. February 2023, 17:34 by bansalsaab
Beautiful puzzle. Thanks for this.
on 23. February 2023, 15:22 by Niverio
Brilliant puzzle! The minimalistic nature of the grid slowly unravels its magnificent secrets beautifully!
on 23. February 2023, 15:18 by Qodec
Clarified there's no negative constraint.
