Wildfire
(Published on 11. July 2026, 22:00 by PrissyP)
Rules
Normal Sudoku
- Fill every row, column, and 3×3 box with the digits 1–9 exactly once.
Fire
- Every cell is either Burning or Safe.
- All Burning cells form one orthogonally connected region.
- All Safe cells form one orthogonally connected region.
- No 2×2 area may be entirely Burning or entirely Safe.
Burning Cells
- Burning cells only contain digits 5–9, except for the two given Burning 4s, which ignited early.
- Safe cells may contain any digit unless restricted by another rule.
Thermometers
- Digits must strictly increase from the bulb to the tip.
- On every thermometer, digits 1–4 remain Safe, while digits 5–9 are Burning.
Solution code: Row 7
Last changed on on 11. July 2026, 22:04
Solved by efnenu, dinonugs, SKORP17, DarthV13, galium_odoratum, stranac, gdc, geronimo92, sedici, MartinR, yuripuppies, Toxter, kangaroo, paranoid, MattYDdraig
Comments
Last changed on 19. August 2026, 16:30
on 18. August 2026, 19:16 by yuripuppies
I suck at yin-yang puzzles but this one went quite smoothly for me! Something about the thermometer logic just made it click. I'd call it on the harder end of 2*
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Glad it clicked for you and thanks for all of your nice comments. I enjoy reading all of them :)
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Last changed on 12. July 2026, 00:06
on 11. July 2026, 23:42 by dinonugs
Great puzzle! Lots of nice incremental steps. Closer to 3* for me.
Thank you, yes I thought it was somewhere between 2 and 3*, had to choose one
on 11. July 2026, 22:04 by PrissyP
Changed the finishing message
