Logic Masters Deutschland e.V.

8x8=9x9

(Eingestellt am 13. August 2022, 17:30 Uhr von filuta)

This puzzle is a full sized version of my previous puzzle 3x3=4x4 (where you can also find a miniature example puzzle for the ruleset 2x2=3x3 :o)).

Huge thanks to ctc discord users DarthParadox, samish, rotobagel and KNT for the time they spend testing either version of the puzzle and their valuable feedback.

Enjoy the puzzle, I will be happy to read your comments.
Rules:

-fill in the grid with digits 1 to 9 with no repeats in any row or column,
-draw nine - potentially partially or completely overlapping - orthogonally connected areas (of size 9) each containing digits 1 to 9 once each such that each cell is a part of some area,
-digits on an arrow sum to the digit in the corresponding circle where each digit (both on an arrow and in a circle) is considered multiplied by the number of areas it belongs to.


To avoid any confusion - there are three arrows joining at r7c7 (starting at r6c5, r7c5 and r8c6) with a joint tip at r8c8. No arrow goes through any circle.


Solve the puzzle online via:
ctc app
penpa+ (or an extended version with a separate grid for indicating areas)

Lösungscode: Row 3, then for every domino in row 6 (from left to right) the number of areas it belongs to (so how many areas contain both r6c1 and r6c2, then both r6c2 and r6c3 and so on) - 15 digits total.

Zuletzt geändert am 13. August 2022, 18:55 Uhr

Gelöst von Samish, KNT, Vebby, MagnusJosefsson, ma3n, Jesper, polar, Myxo, Bellsita, MicroStudy, Chilly, pkp, Yann, WedgeOfCheese, SXH, pandiani42, halakani, wullemuus
Komplette Liste

Kommentare

Zuletzt geändert am 29. Oktober 2023, 17:28 Uhr

am 29. Oktober 2023, 13:47 Uhr von wullemuus
Phew. What an incredible monster! I'm far away of telling that the breakin was easy. Figuring out the CC construction was quite hard as well. The arrows and the given digits were really very well chosen contraints. And the function of cells with multipled digits to build up unusual grids was extraordinary. Wow!
...........
Thanks, congrats for the solve!

Zuletzt geändert am 4. Oktober 2023, 20:43 Uhr

am 23. September 2023, 14:19 Uhr von halakani
This puzzle is so good that even entering the solution code is a tiny puzzle by itself. 10/10.
.........
haha, thanks a lot, yeah, finding a good idea (and formulation) for the solution code was a little challenge for me too

Zuletzt geändert am 12. Juli 2023, 19:45 Uhr

am 12. Juli 2023, 03:35 Uhr von SXH
This is my first time commenting on LMD because this Sudoku is too powerful. I can't help but express my admiration for it. It is the most difficult Sudoku I have solved so far, and I spent 389 minutes solving it.Great puzzle, thanks!
..............
Thanks a lot for the comment. Yeah I absolutely get what you are saying I needed like two months just to find enough courage to make it.

Zuletzt geändert am 25. Juni 2023, 09:31 Uhr

am 24. Juni 2023, 09:34 Uhr von Yann
I did it! What a beautiful puzzle! The break-in wasn't too hard, it was important to consider every option, and the rest of the solve is "quite" straightforward (because I missed some obvious deductions about which digit was missing in a certain row/column, so I wandered into the realm of mini bifurcation, but not totally). I still think that this puzzle is harder than misfits, but not because of the complexity of the solution path, but because of the rules, it's easy to overlook an option. The region building was so miraculous I actually wondered how many attempts it took you to have a unique grid. In any case, thanks for setting this (the 12th hardest sudoku in the portal), and I look forward to trying to solve the third twin or friends in unknown lands.
...........
Thanks a lot for the comment. Yeah I really hope I will manage to add the third part of the series, its quite scary though. But maybe I will manage, when the first anniversary of this one is coming.

Zuletzt geändert am 2. April 2023, 09:06 Uhr

am 2. April 2023, 01:35 Uhr von Myxo
What a mind-blowing puzzle! Thanks for setting.
......
Thanks a lot, it was a real pleasure to watch your solve.

Zuletzt geändert am 2. November 2022, 22:48 Uhr

am 1. November 2022, 13:31 Uhr von polar
A totally astonishing & unforgettable puzzle! The smoothness of the solve path after the break in is spectacular. Thank you very much! :)
..........
Thank you so much! I can't explain with words how happy such a comment makes me, and coincidentally you solved this puzzle at the same day I finished setting of the next one in (now apparently) the series. What a great day!

Zuletzt geändert am 26. August 2022, 12:56 Uhr

am 25. August 2022, 19:05 Uhr von Jesper
Great puzzle, thanks! Very challenging, especially the start. Astonishing how well it resolves in the end.
..........
Thanks a lot!

Zuletzt geändert am 19. August 2022, 03:22 Uhr

am 18. August 2022, 16:12 Uhr von MagnusJosefsson
Amazing puzzle that is truly a very different experience from any other I have solved on this site. Very challenging but also extremely rewarding.
...........
Thank you so much!

Zuletzt geändert am 17. August 2022, 11:42 Uhr

am 15. August 2022, 20:36 Uhr von Vebby
Extremely tricky. Solvers need to be careful what regions are possible / where region overlaps may lie. Very impressive construction.
............
Thank you!

am 13. August 2022, 18:55 Uhr von filuta
changed solution code description

am 13. August 2022, 18:42 Uhr von KNT
Fascinating puzzle, one of the most deviously tricky break-ins I have ever seen. To my surprise, the puzzle flows very nicely once you lay out some initial groundwork.

Assuredly one of the most unique puzzles I have ever solved, and it was a pleasure to test, despite having absolutely zero idea what to do for the first hour of my solve.

am 13. August 2022, 18:29 Uhr von Samish
This puzzle is a full journey through this daunting ruleset, that carries us through the full range of emotions only the very best puzzles can give. Absolutely amazing

Schwierigkeit:5
Bewertung:99 %
Gelöst:18 mal
Beobachtet:7 mal
ID:000ASB

Neu Online-Solving-Tool

Lösung abgeben

Lösungscode:

Anmelden