Normal Sudoku rules apply.
Dutch Flat Mates: Every 5 in the grid must have a 1 directly above it or a 9 directly below it. It may have both, but it doesn't need both.
Snug Between Lines: Digits on a line between two circles must have values between the digits in the circles. Each circle digit must be consecutive with at least one digit on the line.
For example, (2)-7-3-5-(8) is a valid fill for a Snug Between Line.
If you enjoy Snug Between Lines and would like to see some other puzzles featuring Snug Between Lines, check out the budding Snug Between Line series!
Solution code: Column 9 (top to bottom)
yesterday, 00:19 by damo_89
These two constraints pair so nicely. Loving the snug constraint!
on 26. November 2025, 16:54 by ViKingPrime
Very impressed with how the Dutch Flat Mate rule is woven throughout.
on 26. November 2025, 16:54 by Franjo
Tricky new episode of the DFM-series! Thank you very much for creating and adding this puzzle.
on 26. November 2025, 14:50 by Flinty
Thank you for this lovely puzzle :)
on 26. November 2025, 13:18 by marcmees
tricky to start but solves nicely once completely understood the rules. Thanks for this nice contribution to the DFM series.
on 26. November 2025, 08:25 by Playmaker6174
I spent like over 10 minutes staring at the grid without any useful deduction, just to then remember that the between line variation applies to every circle digit and then finally I could gradually progress...
Still, very interesting puzzle that utilizes DFM pretty well here x)
| Difficulty: | ![]() |
| Rating: | 95 % |
| Solved: | 41 times |
| Observed: | 0 times |
| ID: | 000QB0 |
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