Sooty grin
(Published on 13. August 2025, 05:30 by NicoD)
Rules
Normal sudoku rules apply.
The grid is covered in fog. Placing a correct digit will clear the fog from that cell and potentially from other cells somewhere in the grid. No guessing is required.
Each blue line is both a "region sum line" and an "index line".
Region sum line: box borders divide each blue line into segments with the same sum.
Index line: the digit in the Nth cell along the line (starting from the diamond) indicates the position on the line where the digit N appears.
Solution code: Column 1
Comments
today, 00:44 by MysticMan
Lovely puzzle!
on 31. August 2025, 15:50 by Snookerfan
Brilliant puzzle! There were some tricky and surprising steps, which I liked a lot. Thank you
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ND: You are welcome!
on 15. August 2025, 14:11 by zembrost
very unique and well done construction! little tough for me but i loved it all the way through
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ND: Congrats and glad you liked it!
on 14. August 2025, 13:31 by GeorgeTheToad2
Very nice and well constructed. I liked this duality line. Thank you.
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ND: You are welcome!
on 14. August 2025, 05:59 by fitzie
this was a super clever solve. I think a bit trickier to find the next step at times, so I'd rate it a 2+. well worth the time.
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ND: Thanks for the feedback!
on 13. August 2025, 17:45 by PinkNickels
Beautiful construction! Thanks for sharing!
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ND: You are very welcome!
on 13. August 2025, 15:03 by Franjo
Indeed. I really enjoyed solving this puzzle very much. Thank you for creating and sharing it.
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ND: You are welcome, Franjo!
on 13. August 2025, 13:32 by Zibl
Really nice puzzle! The index constraint really helped for me. Wish all RSL puzzles did that from now...
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ND: Indeed that would be easier!
on 13. August 2025, 13:28 by Cane_Puzzles
Very cool! This is my first time seeing index lines, don't know when they were discovered. They seem to have a lot of potential.
Can anyone recommend more index line puzzles to me?
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ND: Thank you for solving! ChinStrap has got a lot of really cool index lines puzzles, you should check them out. In particular, the following ones have been featured on CtC: 000KY3, 000L2N, 000LI0.
on 13. August 2025, 10:20 by sujoyku
Very nice puzzle! Index Lines go along well with RSL. And you set up some really interesting interactions. Thank you, NicoD!
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ND: You are welcome, sujoyku!
on 13. August 2025, 06:37 by Fizz
That was fun with some very cool logic, thanks!
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ND: You are welcome!
on 13. August 2025, 05:57 by antiknight
Some interesting logic emerged from combining these rules!
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ND: It is a bit too powerful so the fog makes it a bit harder.
