Day and Night
(Published on 10. March 2026, 19:57 by balpha)
Normal Sudoku rules apply.
During the day, the herd spreads out to find food: Inside a box with a sun, no two even digits are orthogonally adjacent.
During the night, the herd cuddles together: Inside a box with a moon, the even digits form an orthogonally connected region.
The celestial bodies are always odd, with a sun 5 or higher and a moon 5 or lower.
An even digit has a difference of at least 5 with any orthogonally adjacent sun or moon (regardless of whether they share a box).
Solution code: Row 2
Comments
on 12. March 2026, 11:59 by Franjo
Thank you very much for creating and sharing this lovely puzzle. So even sheep found their way into a Sudoku ground.
[balpha:] Interesting that you're thinking of sheep! I couldn't say what animal exactly I was thinking of, but it wasn't sheep. More like something in the desert. But I guess either could work :D Thank you for the kind comment!
on 11. March 2026, 18:32 by firespire
My kind of puzzle, rules were new to me and for me easy to follow and complete.
Cell relationships without lines everywhere was fun.
[balpha:] Happy to hear you enjoyed it, thanks for the praise!
on 11. March 2026, 10:23 by pjot
I was stuck for a long time until I realized that I had missed the last rule. After that it flowed nicely, very nice puzzle. Thank you
[balpha:] Indeed, that rule is quite vital :D I appreciate the feedback, thank you!
on 11. March 2026, 03:59 by macintux
I enjoyed that a great deal, thanks. The rules played off each other nicely, some deductions caught me by surprise.
It is easy to err when deducing polarity of a cell, which can throw off the entire board, so I’m grateful for the ability to periodically run an error check to make sure I haven’t gone off the rails.
[balpha:] Happy to hear you liked it, and I appreciate the feedback!
on 10. March 2026, 21:38 by dzamie
Aww, that was fun.
[balpha:] Glad you enjoyed your little safari :D
