Galaxies Collide (Again!)
(Published on 13. August 2026, 15:50 by marty_sears)
Rules:
Divide the grid into two galaxies of orthogonally connected cells. No 2x2 area may be completely within one galaxy. Both galaxies must be rotationally symmetrical through 180°.
A digit in a green circle indicates how many cells in its sudoku box are in its galaxy.
A digit in a red square indicates how many cells in its sudoku box are NOT in its galaxy.
One of the two galaxies is special. In that galaxy, for any two orthogonally adjacent cells, dividing one digit by the other always gives an exact integer (one is a multiple of the other.)
Solution code: Column 9 reading downwards
Comments
on 27. August 2026, 22:42 by davidz32z
Just lovely and long enough gap for a sequel that I had completely forgotten every bit of logic and got to discover it all over again!
on 19. August 2026, 16:23 by blackjackfitz
Huzzah!
on 18. August 2026, 01:39 by QuiltyAsCharged
So many great "aha" moments in this one!
on 16. August 2026, 14:08 by Srinidhi Kabra
Marty, I don't know how you do it, but your puzzles are always so great! As always, a highly recommended and a beautiful solve!
on 15. August 2026, 09:22 by mscha
Tough but fair. I did the original before solving this one (with a bit of help from CtC), which helped a lot with the initial findings, of course.
Still, 4 stars for me.
Oh, and a belated happy birthday to Dorlir!
on 14. August 2026, 03:38 by Tortugo
I think I found this tougher than other solvers. I made a major logical error around the midpoint and it was a gnarly beast to unravel, as is always the case when backtracking in these coloring puzzles with such narrow deductions made along the way. With that said… more please!
on 13. August 2026, 23:18 by Prof.Dori
Thank you very much for this puzzle you made for my birthday I enjoyed from start to finish and was quite challenging and really enjoyed the minimality of the clues which is quite nice and powerful. Thank you again and can't wait for other puzzles in future with what you will come up.
on 13. August 2026, 22:04 by Fool on Hill
A worthy sequel - Happy birthday Dorlir - I am sure you enjoyed this interesting riff on the galaxies logic.
on 13. August 2026, 21:12 by Franjo
Thank you very much for creating and sharing another amazing puzzle. My evening is saved! Happy birthday, Professor!
on 13. August 2026, 20:33 by SennyK
Great puzzle! :-)
on 13. August 2026, 18:09 by emoney1374
Phenomenal puzzle! Probably 4 stars, but I had an easier time of it knowing some tricks
on 13. August 2026, 18:06 by amirs
Beautiful puzzle! I really enjoyed the break-in and middle game, some very neat deductions that make the solver feel clever.
on 13. August 2026, 16:47 by MonsieurTRISTE
Tricky :)
on 13. August 2026, 16:34 by Piatato
Cool!
