Toroidal Galaxy Killer Sudoku
(Published on 7. June 2020, 10:11 by stephane.bura)
This puzzle is a mixture of a Killer Sudoku and a Galaxy Puzzle.
The usual sudoku rules apply.
The dots given in the grid are the centers of pointsymmetric galaxies, which function as cages for the killer sudoku.
The grid is toroidal, so a galaxy can expand across its edge and continue on the opposite side. Galaxies can't overlap.
In contrary to a classical galaxy puzzle, not every cell in the grid has to be part of a galaxy.
The sum of a galaxy's digits is 21.
There are marked cages in the grid.
The sum of a cage's digits is 23.
The digits in a cage or a galaxy may not repeat but the cages and the galaxies do overlap.
Penpa-Edit link for this puzzle to play it online.
Solution code: Row 2, row 3
Comments
on 7. September 2025, 18:28 by stephane.bura
Added rules about no overlapping.
on 7. September 2025, 17:27 by rich_27
To round off the links, here's my sudokupad version: https://sudokupad.app/xw15y4u97y
Interestingly, you don't specify that the galaxies can't overlap, so the top left galaxy has two possible shapes!
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It's a standard rule for galaxy puzzles but you're right!
on 17. January 2021, 00:38 by checkoway
Here's an f-puzzles link. https://f-puzzles.com/?id=y3tt3xgk
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Thanks checkoway :)
on 9. August 2020, 22:18 by stephane.bura
Repaired broken link.
on 9. August 2020, 22:06 by geronimo92
Sorry penpa link seems broken.....
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Thanks for telling me geronimo92 :)
I took the opportunity to switch to Penpa+ with its neat new options
https://github.com/swaroopg92/penpa-edit/blob/master/README.md
