Suns and Moons

(Published on 31. August 2024, 14:17 by H.Bell)

After the "sun" idea from my previous puzzle, I had to make one with "moons." Enjoy :)

Play on SudokuPad

Rules:

Normal 9x9 sudoku rules apply; Place the digits 1-9 once each in every row, column, and 3x3 box.

Nonconsecutive: Orthogonally adjacent digits may not be consecutive (i.e. they may not have a difference of one).

Anti-knight: The digits in the yellow (Sun) cells may not repeat in any cell that is a knight's move away from it (a knight's move as defined in the rules of chess). Not all cells with this constraint are necessarily given.

Anti-King: The digits in the gray (Moon) cells may not repeat in any cell that is a king's move away from it (a king's move as defined in the rules of chess). Not all cells with this constraint are necessarily given.

Solution code: The first (topmost) row, left to right.

Solved by Gosciola19, fuxia, Postnormal, miranda_9, tgstar, Notlob, NCtide, pepe74287, kkli, mos, seeppp, amchap, running_fatty, jadezki, SKORP17, etoler, cmigas, brandon_bot, Dr Logic, Onkel_Dagobert, ... Calesch, toboed, flaemmchen, naftbefehl, asver, Slumped_5, josemadre, DutchMark, TagEule, edithp, tartedavocat, jjtheplum, FireTruckFuel, koiking, radium, LeLoyJenkins, gadgetgreen, DylanRay, addie

Full list

Comments

on 8. March 2025, 23:17 by FireTruckFuel
I had to mark this puzzle pretty thoroughly to see some of the digits along the solve path. This was my first non-consecutive solve. Good practice!

on 15. January 2025, 01:06 by edithp
Very satisfying solution! :)

on 9. October 2024, 12:15 by Frank Puzzles
https://youtu.be/OnyQzoYYIQs

Here's a link to my solve of the puzzle. It was fun!

on 20. September 2024, 23:07 by Decapod
I think I solved this without ever using the moon (anti-king) constraint? I'll have to do it again and see if that's true.
I like the partial anti-knight, even if it makes scanning for singles trickier.

on 9. September 2024, 16:30 by Tingo
Absolutely loved this puzzle. Anti-knight constraints that don't apply throughout the puzzle is something I've worked with and set as well and I think it's an absolute game changer rule. Thank you for setting and sharing!

on 31. August 2024, 21:03 by Fisherman
Tough one. Job well done.