Logic Masters Deutschland e.V.

Japanese Sum Cave Cipher #4: Twilight Cave Clues

(Eingestellt am 23. Oktober 2022, 06:02 Uhr von KNT)


Place the digits 1 to 9 exactly once in each row and column of the grid, and some cells in the grid are to be shaded such that the final shading of the grid resembles a valid cave (All unshaded cells are orthogonally connected and all shaded cells are orthogonally connected by other shaded cells to an edge of the grid).

Outside clues are Japanese sum clues. "?" is a stand in for any digit 0-9, but for a double digit number, the first digit may not be 0. Each distinct letter represents some unique digit from 0 to 9.

Clues to the left of the grid are Japanese sum clues for either shaded or unshaded groups of cells, where each group needs at least one of the other (shaded or unshaded) to separate the groups. Clues to the top of the grid are Japanese sum clues for the OTHER of shaded or unshaded. (That is, if it turns out clues to the left indicate sums of unshaded blocks, clues to the top indicate sums of shaded blocks). Either all or no outside clues are given for each row and column.


There are some circles in the grid. If a cell with a circle is unshaded, then the digit placed in that cell is a valid cave clue. That is, it indicates the number of cells (including itself) seen within the cave from that location in all four orthogonal directions, where shaded cells obstruct vision. If a cell with a circle is shaded, then the digit placed in that cell indicates the total number of cells in the orthogonally connected shaded region it belongs to. Not all circles are necessarily given.

Play on Penpa+!

Answer check is enabled with blue sudoku digits.

Below is an example on the digits 1-6. For the simplicity of a smaller puzzle, A-D are restricted to only the digits 1-6.

Example puzzle

Lösungscode: Row 2 followed by Row 8

Zuletzt geändert am 10. November 2022, 19:35 Uhr

Gelöst von polar, Xendari, Jesper, MagnusJosefsson, Koalagator2, ascension, ONeill, Niverio, Vebby, marcmees, harrison, AnnaTh, ibag, misko, ffricke, jkuo7, Mark Sweep, Alex, RJBlarmo, ch1983, dunder, wooferzfg, Jakhob, Uhu, Myxo, lerroyy, Sewerin, Gliperal, Agent, rmn, cornuto, zuzanina, Piatato, gynu, akamchinjir, Jaych, Tom-dz, Christounet
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am 27. September 2023, 19:42 Uhr von Christounet
I got some quiet time today, so I decided it was about time I tried to catch up with this wonderful series. Superb as always. Thanks :)

am 15. Mai 2023, 12:13 Uhr von Piatato
Lovely! Awesome solve path with some cool surprises :)

am 15. Februar 2023, 09:45 Uhr von Agent
Great puzzle! Very narrow and rewarding solution path, with one particular clue that came out of nowhere.

am 23. Dezember 2022, 07:05 Uhr von wooferzfg
Beautiful puzzle. The scanning in this one was tough, but I enjoy being stuck :)

am 10. November 2022, 19:35 Uhr von KNT

am 1. November 2022, 16:49 Uhr von ibag
Mal wieder großartig!

Zuletzt geändert am 24. Oktober 2022, 18:15 Uhr

am 24. Oktober 2022, 17:13 Uhr von marcmees
Great puzzle. Lots of cool logic to discover in this one. Thank you.

am 23. Oktober 2022, 18:45 Uhr von MagnusJosefsson
Fantastic puzzle, I think the addition of the circled clues really added a lot more variety of logic which was cool. Thanks KNT!

am 23. Oktober 2022, 08:16 Uhr von Xendari
Very beautiful, as with all entries in this series. Thank you :)

am 23. Oktober 2022, 06:08 Uhr von polar

Always happy to solve your puzzles & I don’t intend on stopping anytime soon either :)

Zuletzt geändert am 31. Dezember 2022, 23:25 Uhr

am 23. Oktober 2022, 06:01 Uhr von KNT
This was the last of the puzzles in my posting backlog, and should be easier than the previous two. I have been having a lot of fun with this series, and I hope you all are enjoying solving it half as much as I am setting it. I still do have quite a few more ideas for this series in the future, most of which are very wildly different than any I have posted so far, and I hope you look forward to them.

I know I don't reply to every comment on my puzzles, but please do know I appreciate every single one, and I would like to say thank you to everyone for the overwhelmingly positive feedback you give me on a regular basis. It really fuels me to keep doing what I enjoy :)

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