There's Summing in the Dark
(Published on 23. September 2025, 00:43 by Oatmeal)
Solve with SudokuPad
Rules:
Normal sudoku rules apply.
There is ONE, and ONLY ONE blue region sum line, where box borders divide the line up into segments of equal sum. The line cannot intersect itself.
Digits in a quadruple circle must appear in the surrounding cells.
A black dot between cells indicates cell values with a 2:1 ratio. A white dot between cells indicates cells with consecutive values. Not all dots are given.
Digits in a cage sum to the total in the top left. Digits do not repeat in a cage.
The grid is partially covered with fog. Correctly placed digits will clear the fog around that cell. No guessing is required.
Hope you enjoy - post your finish times and feedback in the comments :)
Solution code: Digits from row 9 (left to right)
Comments
on 1. December 2025, 18:39 by VitP
tricky 6 in box 9
on 5. November 2025, 08:32 by Zarlino
Very enjoyable: thank you for setting. 7'00" which was pretty pleasing, especially first thing in the morning.
on 1. November 2025, 21:57 by eap314
The 14 cage was a nice constraint. Overall very lovely.
on 5. October 2025, 23:55 by meggen033
Very nice ONE LINE ONLY puzzle! The solve was extremely smooth and although it was nice and easy, it made you think throughout the whole puzzle. Well done and look forward to more!
on 27. September 2025, 03:04 by DK_48
sehr schön
on 24. September 2025, 02:06 by joesaysso
Very fun solve. Approachable for people with limited experience in variant sudoku. Great job!
on 23. September 2025, 22:36 by sujoyku
Lovely puzzle! Thank you, Oatmeal!
on 23. September 2025, 15:24 by Oatmeal
Sure Fra314. My puzzles are all free to be solved or made into a solve video by anyone who would like to :)
on 23. September 2025, 14:43 by Fra314
Lovely! May I recommend your puzzles to BremSter? Thanks!
on 23. September 2025, 13:13 by SquareCat
Fun puzzle with great unveiling and use of constraints! Thank you!
on 23. September 2025, 12:49 by SudokuFan
00:08:55
on 23. September 2025, 11:26 by Zibl
Cute puzzle!
on 23. September 2025, 11:04 by cdeelman
15:12, that was fun! The first digits were easy, but I had to guess about the 3 in block 4. My hunch was right, but I couldn't really find a compelling conclusion.
on 23. September 2025, 03:21 by NotSoMagnifique
Charming!
on 23. September 2025, 01:34 by fishsaltyak
Pretty fun! Thanks!
on 23. September 2025, 01:13 by Oatmeal
Reactivated puzzle
