Xtreme Ziplining
(Published on 11. November 2023, 20:04 by gdc)
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.
- X-Sums: Digits in tabs (outside the grid) indicate the sum of the first N digits looking into the grid in the row/column, where N is the first digit seen. For example: If the tab above column 2 contained an 8, the column could start with 2 and 6.
- Zipper Lines: Digits an equal distance from the circled center of a line sum to the central digit.
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.
Solve Videos
You can find live solves of this puzzle on YouTube by Apiyo and BremSter.
Solution code: Row 5 (9 digits)
Comments
on 26. March 2025, 23:40 by gdc
add links to solve videos
on 26. March 2025, 23:30 by gdc
update rules wording
on 21. December 2023, 18:50 by Fra314
A fantastic puzzle, beautifully constructed and really really clever. Amazing!
on 21. November 2023, 17:54 by glum_hippo
A pleasure
on 15. November 2023, 20:24 by Workout9
Very interesting and beautiful interactions! Thanks :)
on 14. November 2023, 07:25 by EmpyClaw
Wow! That was phenomenal. As I started, I wasn’t sure if I was going to break in, and then I started to put things together and it all flowed very quickly. That was a lot of fun and quite satisfying. Thanks so much!
on 12. November 2023, 19:22 by Klausku
Brilliant puzzle. I especially liked the interactions across the grid.
on 12. November 2023, 17:14 by Flinty
This puzzle deserves a lot more than 4 solves. :(
It's far more approachable than perhaps some folk are thinking? I hope this comment convinces a few more people to give it a go.
on 12. November 2023, 12:26 by gdc
add "technical notes" to puzzle description
on 11. November 2023, 21:59 by gdc
thank you abadx! VikingPrime recently created some puzzles that combine zippers, whispers and renbans.
on 11. November 2023, 21:35 by abadx
Interesting interaction between xsums and zipper lines. I would love to see more mixing between zipper lines and other kind of lines
