Mercury Lamp
(Published on 25. October 2025, 08:26 by Kutsumi Hane)
- Normal Sudoku rules apply, i.e. each row, column, and 3×3 region has to contain the digits from 1 to 9 once each.
- The orientation of each mirror is determined by the digit in its cell:
- odd digits → main diagonal (＼)
- even digits → anti-diagonal (／)
- Light paths may cross one another but cannot pass through a mirror — when a light path meets a mirror, it always reflects by 90°.
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If a mercury lamp reflects any light, it lights up; the mercury inside vaporizes into mercury vapor, and the thermometer containing that lamp becomes inoperative.
Otherwise, the thermometer functions normally: the digits along the thermometer must increase strictly from the bulb toward the tip.
Here you can solve the puzzle online:
Solve on SudokuPad
Solution code: Digits on the line in row 1.
Comments
on 10. November 2025, 05:39 by RubberMittens
If light hits a thermo bulb and lights it up, we should treat the thermo as not existing at all, including the standard restriction of increasing numbers along a thermo?
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Response from Kutsumi Hane: Sorry for taking so long to see your message. Yes, that’s correct — the thermo should be treated as if it doesn’t exist at all, including the usual rule about numbers increasing along it.
on 29. October 2025, 13:47 by amaoto
nice setting! solved in 1 hr
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Response from Kutsumi Hane: Thank you! Glad you liked it.
on 25. October 2025, 17:15 by Kutsumi Hane
The puzzle's title and instructions have been clarified for better readability; the puzzle itself remains unchanged.
on 25. October 2025, 09:45 by Piff
solution code is just whole row 1
