Normal Sudoku rules apply.
Digits in a circle must appear at least once in the four cells surrounding the circle.
Around each circle, at most one cell can contain an odd digit.
All cells containing odd digits form a single contiguous, orthogonally connected region.
Thanks to Cristopher Moore for testing!
Solution code: Row 1
on 3. April 2024, 16:55 by lmdemasi
Satisfying solve, especially using the single region constraint.
on 29. April 2023, 01:01 by dennischen
Dang this is really hard. Awesome puzzle!
on 22. April 2023, 18:34 by koba1917
One of the best puzzles I've solved! Really fun and interesting rull set
on 19. April 2023, 10:36 by Tamuha
Very fun und nicely crafted puzzle. It took me a while, but I had a great time.
on 19. April 2023, 03:58 by thoughtbyte
Awesome puzzle! thanks.
on 19. April 2023, 03:00 by SimplePurpleFrog
Beautiful interactions, great fun to solve, thank you.
on 19. April 2023, 02:35 by Ragna
Very interesting and very astonishing ruleset. I had fun!
Thank you for sharing. :-))
on 18. April 2023, 17:40 by mathpesto
As a big time quad-lover, this was a really innovative and fun implementation! Would make for a great CtC feature.
on 18. April 2023, 17:10 by slowbiex
took me a while but this is just fantastic!
Thanks for setting.
on 18. April 2023, 01:43 by sacklunch
Wow, what a gorgeous puzzle. Such a seemingly simple layout, but navigating the solve path is a beautiful challenge. The deductions are tricky without ever being too hard, it flows really well. Love to see Simon tackle this one!
on 17. April 2023, 22:50 by cristophermoore
This is a great puzzle! The ruleset creates really nice interactions between parity and geometry. Bravo!