Countdown to 2026
(Published on 30. December 2025, 23:59 by WEBthe3rd)
Normal sudoku rules apply.
Note: All lines have a maximum length of 4 cells.Dynamic fog - The grid is covered in fog. A correctly placed digit will clear any fog in that cell, and potentially in other cells as well. No guessing is required.
Sandwich Sums - Digits outside the grid indicate the sum of the digits found between the 1 and the 9 in the indicated row or column.
Anti-Kropki - Digits separated by a red ❌ are not consecutive and are not in a 1:2 ratio.
German Whisper - Digits along a green line must differ from their neighbors by at least 5.
Parity Lines - Digits along a red line must alternate between even and odd.
Renban Lines - Digits along a pink line must form a consecutive, non-repeating set in any order.
Region Sum Lines - Digits along a blue line are divided into segments with equal sums by the box boundaries.
Solution code: Column 9 from top to bottom
Comments
on 13. February 2026, 05:31 by Ratzfaz
Nice puzzle and not to hard. But only, if u don't miss the 4 length rule ;-)
on 24. January 2026, 20:58 by ryv3x
One of the best fog sudokus i've ever done! such great logic behind every step, feels like everything is intended. Imo deserves a 100% rating maybe even more!
on 11. January 2026, 22:58 by MattJones
Deserves a vastly higher rating. Intelligent, smooth and fun.
on 11. January 2026, 18:13 by HereBeNames
If I saw this right, the assumption that a line can make no sharp turn is needed. i.e. a line can not turn 135degree. At too points I thought that a line could still go to a second cell, f 135° turns were allowed and just guessed it wasn't.
on 2. January 2026, 23:53 by oklux
Nice puzzle! Happy new year!
on 2. January 2026, 01:16 by CarnacTheMagnificent
Awesome setting. Thanks for the puzzle.
on 31. December 2025, 18:17 by Martina
I loved it, thanks for setting!
on 31. December 2025, 15:27 by MartinR
Nice puzzle, lots of small deductions not difficult but also non trivial (although I did initially miss the rules on line length, but that's my bad)
Agree with SennyK on rating too - I do think fog of war puzzles can suffer from this more due to their nature.
on 31. December 2025, 04:12 by SennyK
Great puzzle idea and beautiful execution, I do not understand why this is rated so low. Deserves higher rating. Happy New Year!
on 31. December 2025, 02:48 by War
Hey Russ, this is very solvable. A few tips:
Start with the sandwich sums, then there will be a GW forced digit. Then another GW digit will play with the sandwich in column 3 and you have broken in the puzzle. The thing to remember from here is that every line has a max length of 4, which is necessary to solve the renbans that follow.
on 31. December 2025, 02:15 by RussKozerski
Is this solvable? I've never struggled so much with a 1-star puzzle.
