Logic Masters Deutschland e.V.

This puzzle combines Zipper Lines (ruleset form Jaze) with X-sums. Thanks flinty for that idea and users on the CtC-fan-discord for testing. The puzzle is meant to be relatively approachable. However, If you've never seen Zipper Lines before, I'd recommend solving Zip-a-De-Doo-Dah first.

• Normal sudoku rules apply.
• Digits an equal distance from the center of a lavender 'Zipper Line' must sum to the digit in the middle of that line.
• X-sums: Digits outside the grid indicate the sum of the first N digits, where N is the first digit seen from that clue.

Play Online: CtC

Example Puzzle

Here is a 4 by 4 example from Jaze (left) and it's solution (right). Notice how the ends of each line sum to the digit in the center of the line. Additionally, the long line also contains two more sums 4=1+3=1+3=2+2. You can play the example here.

Do you want to solve more?

Click here to search for more Zipper Lines puzzles on LMD.

Technical Notes

This puzzle was set in f-puzzles as a 11x11 with the central 9x9 representing the grid and the outer ring representing the outside clues. Because of that, the conflict checker will be disabled for some rows/columns. The "puzzle completed" popup will only appear if the outside clues with a zipper line going through them are all filled as well.