Normal sudoku rules apply.
A number in a cell with a circle is the same as the number of the surrounding cells (not counting the cell itself) with odd numbers. (So a total of 8 possible surrounding cells.)
All possible circles are given.
The puzzle:
solving online: f-puzzles:
Solution code: Column 8, top to bottom, no gaps between numbers.
on 1. June 2022, 01:06 by Samson
Fun puzzle! The unique rule set made for some original logic.
Thank you!
on 15. March 2022, 01:11 by Piatato
Fun puzzle!
on 14. March 2022, 18:36 by Bankey
Good fun! Thanks, @ Thorsby :)
on 14. February 2022, 05:45 by Droi
Lots of fun.
CTC Link: https://app.crackingthecryptic.com/sudoku/jDNqJNjtdG
on 13. February 2022, 19:42 by Klausku
Great puzzle! Nice ruleset an a beautiful construction. The negative constraint was not necessary for the solve. Thanks!
on 29. November 2021, 09:23 by CHalb
Without givens quite fascinating for me.
on 24. November 2021, 16:31 by Wonderment
Beautiful minimalistic puzzle with a simple ruleset and a very enjoyable solving path. Nothing too tricky. I was repeatedly surprised how quickly the number of candidates for some of the circles got down to one.
on 23. November 2021, 18:02 by kolot
Lovely puzzle with a smooth solution path!
on 23. November 2021, 13:54 by Statistica
BTW: Puzzle 4PL has the same ruleset (with even numbers)
on 23. November 2021, 12:03 by marcmees
very nice. smooth solving path. thanks
on 22. November 2021, 21:31 by ClashCode
First time I've encountered this rule-set.
I quite enjoyed it! :)
on 22. November 2021, 20:00 by Thorsby
Changed a word in rules.