Logic Masters Deutschland e.V.

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This is the first puzzle in a new mini-series titled Deja Vu. What does that mean, I wonder...the first person who is able to correctly guess what the series is about will get free access to all of my patreon-exclusive puzzles for February 2026 (5 puzzles). It's a fair bit easier to guess once more puzzles are out, but it is technically possible to guess it now if you get really lucky. Wasn't 100% sure on difficulty here, I put 2 stars overall but some of the early steps are tough so maybe it's 3, I'm not sure. You're welcome to disagree!

Rules:

• Normal sudoku rules apply. Place the digits 1-9 in each row, column, and 3x3 box without repetition.
• Renban: Digits placed on purple lines must be a non-repeating set of consecutive digits in any order.
• Killer Cages: Digits in dotted-line cages must sum to the number in the top left corner of the cage. Digits may not repeat within a cage.
• Consecutive Pairs: Digits separated by a white dot must be consecutive.
• Duplicate Lines: Each light blue line contains exactly 1 unique digit. All possible lines are given. For the avoidance of doubt, each line goes straight and does not bend or branch.

Solve on SudokuPad here!

To increase accessibility to my puzzles, I include hints in my puzzle posts (see below). I also post solution videos on my Patreon and YouTube channel. Puzzles released prior to February 2026, as well as my snackdoku and variant sudoku 101 series will continue to get public solution videos on YouTube, while others will be Patreon-exclusive.

Hint 1: 7-cell renbans must have 3-7 on them always, which leaves 1289 leftover. Further, there's only 3 ways you can choose between 1289 depending on how the renban is filled. It must be 12, 19, or 89 leftover. Taking all of this information into account, you can work out a lot of what's going on in columns 6 and 7.
Hint 2: Where must the digits in the 10 cages in columns 1 and 2 go in column 3? You can ask a similar question about the digits on the line going from R3C2 to R4C3.
Hint 3: There is an a strangely powerful Y-wing sort of thing going on with the digits on the R3C7 and R8C6 lines. How do they impact box 9?
Hint 4: Most of the rest of the solve requires using the negative constraint a bunch. Don't forget about it! Any time there is no line between 2 digits, they are not allowed to contain the same digit.