Paper Snowflake
(Published on 22. December 2025, 15:32 by Kainapple)
Rules:
Normal sudoku rules apply.
Digits along an arrow sum to the digit in the attached circle.
Shade some cells such that:
- The digits 1,2,3 are always shaded.
- The digits 7,8,9 are never shaded.
- The shading is symmetrical, reflected in row 5.
- The shading is symmetrical, reflected in the positive diagonal ( ╱ ).
Enjoy!
Solution code: Column 9
Comments
on 8. February 2026, 22:46 by psams
The way the symmetry worked in this puzzle was fascinating.
on 9. January 2026, 17:04 by olc
took a bit of thinking to get the break-in, but very pleasing resolution! probably would have made it easier if I read the title of the puzzle again...
on 9. January 2026, 15:44 by MikeMeech
Very cool concept!
I started of using column 5 instead of row 5, but then realized it didn't make a difference. Same would apply to the diagonal.
on 9. January 2026, 10:54 by 22grapefruits
Very fun! Love the group theory connection. Challenging break-in but felt very logical and smooth after that :)
on 5. January 2026, 02:18 by konklone
This was really cool. I found the start to be tough to wrap my head around what was being asked, but once I adapted myself to your reality, it was a tricky, weird, and reasonable journey to the finish line. Very well done!
on 2. January 2026, 23:50 by deleva
Fine tuned to perfection again.
Awesomely minimalistic and unbelievably innovative witchcraft.
This is a cosmic class achievement. More than just "very nice."
on 1. January 2026, 07:45 by QuiltyAsCharged
Lovely puzzle!
on 22. December 2025, 21:06 by marty_sears
Brilliant idea! Love how the symmetry rule plays such a big part throughout. At first it really doesn't seem like the 5 arrows will be enough to populate the grid, especially with the ambiguity over the middly digits. There is a miraclesque quality here, just like in your first puzzle.
Fantastic execution and a pretty finished result! Merry Christmas
on 22. December 2025, 18:46 by Adrian71
Fun puzzle, I enjoyed it a lot! Thanks for sharing :)
