Lighthouse in the fog / 霧の中の灯台
(Published on 10. August 2026, 10:27 by MonsieurTRISTE)
Click or tap the following image to play. Hope you enjoy!
Rules:
1. Normal Sudoku rules apply.
2. (Dynamic Fog) The grid is covered in fog. Certain digits reveal parts of the grid when placed correctly; other correct digits may not clear any fog except in their own cell. No guessing is required.
3. (Lighthouse) Circles are orthogonal lighthouses. Squares are diagonal lighthouses.
A digit in a circle indicates the number of smaller digits it can see in its row and column combined, not including itself. Larger digits block the view.
A digit in a square indicates the number of smaller AND EQUAL digits it can see in all diagonal directions combined, not including itself. Larger digits block the view, while equal digits DON'T.
Solution code: Row 9, left to right.
Comments
on 13. August 2026, 23:01 by ShuffBeeeell
One of the best puzzles I've done recently, very rewarding. Thanks!
on 11. August 2026, 12:44 by QuiltyAsCharged
Very nice! Some very interesting logic here to discover.
Note that vision is only blocked by digits larger than the lighthouse. If a lighthouse with a 6 is followed by 4-2-8, it will see both the 4 and the 2.
on 10. August 2026, 10:32 by cyddrdrd
Very cool break in and rewarding towards the end!
