Galactic Union (Killer / Spiral Galaxy / Chaos Construction)
(Published on 23. December 2023, 23:26 by Tacosian)
- Divide the grid into regions, each consisting of nine orthogonally connected cells. Each row, column and region must contain the digits 1 to 9 once each. One region border is given between R4C7 and R5C7.
- The dots in the grid are the centers of 180 degrees rotationally symmetric "galaxies" (non-overlapping sets of orthogonally connected cells). Each half of a galaxy forms a killer cage, summing to the number given on its side of the dot. All cells within a cage must belong to the same region. The two cages formed by a single galaxy must belong to different regions.
SudokuPad link (example): SudokuPad
Penpa+ link (example): Penpa+
The PuzzleSudokuPad link: SudokuPad
Penpa+ link: Penpa+
Solution code: Column 4, from top to bottom. Where there is a region border, type X (uppercase). In the example puzzle, the solution code for column 4 would be 163X452X7.
Comments
on 8. March 2024, 16:03 by Fool on Hill
Beautifully done - a sustained challenge with neat things to find at every step until it fills in at the end.
on 7. March 2024, 09:01 by Christounet
Great ! Loved the construction part. Irregular sudoku was the hardest for me because I'm not so good at scanning, but it was still fair. Thanks :)
on 4. March 2024, 13:33 by Silverstep
Brilliant. The break-in itself is beautiful, that goes without saying; but it takes a great mind to make the rest of the puzzle challenging AND still fair at every step.
on 1. January 2024, 01:51 by Agent
Great puzzle, cool geometry and logical flow!
on 29. December 2023, 13:15 by peacherwu2
Incredible geometry. Incredible ruleset.
on 26. December 2023, 04:56 by BHUNTER47
The break-in realization was amazing. After that the region determination went smoothly; but then the irregular sudoku was lovely and complicated as well.
on 25. December 2023, 04:08 by cam
This puzzle was very difficult, but I'm having even more trouble putting into words just how awesome it was to solve. I don't know how you did this--absolute magic.
on 25. December 2023, 00:01 by Jesper
Very nice, thanks!
on 24. December 2023, 20:14 by marcmees
pure magic. thanks.
on 24. December 2023, 17:47 by ONeill
Brilliant, and not too difficult
on 24. December 2023, 16:07 by samuel1997
This is quite a stunning puzzle! The concept in this puzzle is quite clear, but the way to work those regions out is just piece of art!
on 24. December 2023, 13:33 by Lavender Gooms
Loved it. Made it harder for myself than it should have been, but after I realized my mistake it flowed incredibly well.
on 24. December 2023, 12:44 by Snookerfan
Very nice! Lovely break-in. Thank you
