Logic Masters Deutschland e.V.

Japanese Sum Cave Cipher #5: Sisyphos

(Eingestellt am 30. Oktober 2022, 05:29 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.


Clues to the right and bottom of the grid are Sisyphos clues, which is a constraint type invented last year by Phistomefel. A Sisyphos clue indicates how many cells a rock rolls from the adjacent square to the outside clue. Each number represents a hill of the corresponding height, and the rock only ever moves from a higher to a lower hill and then rolls towards the smallest orthogonally adjacent hill. If the two smallest adjacent hills are the same size, the rock rolls straight ahead.

However, all unshaded cells are of a lower height than all shaded cells. Specifically, for the 9x9 grid, there are 18 distinct levels of elevation: the unshaded 9 is lower than the shaded 1. Likewise, for the 7x7 example, there are 14 distinct levels of elevation.

I highly recommend first acquainting yourself with the example puzzle before attempting the 9x9 grid.

Play on Penpa+!

Answer check is enabled with blue sudoku digits.

Below is an example on the digits 1-7. For the simplicity of a smaller puzzle, A-G are restricted to only the digits 1-7.

Example puzzle

Lösungscode: Row 4 followed by Column 4

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

Gelöst von polar, Jesper, ONeill, Koalagator2, marcmees, Niverio, Vebby, ibag, MagnusJosefsson, ascension, harrison, misko, ffricke, Alex, dunder, RJBlarmo, jkuo7, Myxo, Sewerin, lerroyy, Gliperal, Xendari, rmn, akamchinjir, Jaych
Komplette Liste


am 24. Januar 2023, 23:06 Uhr von lerroyy
Really nice puzzle!

am 10. Januar 2023, 01:17 Uhr von Myxo
Easy puzzle.

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

am 2. November 2022, 23:44 Uhr von MagnusJosefsson
Wonderful! Impressive construction and very well implemented solution path!

am 2. November 2022, 16:36 Uhr von ibag
Fantastic! And not as hard as the other ones.

am 1. November 2022, 16:56 Uhr von Vebby
Very nice! One significant hurdle in the beginning after which it all tumbled beautifully to the solution. Thanks KNT! :)

am 1. November 2022, 16:39 Uhr von Niverio
I love how the boulders are immune to friendly blocks :)

Zuletzt geändert am 30. Oktober 2022, 23:40 Uhr

am 30. Oktober 2022, 22:51 Uhr von marcmees
Very nice. The 6 Sisiphos boulders well integrated in the solve. thanks.

am 30. Oktober 2022, 20:07 Uhr von ONeill
Wonderful combination, and very well executed! Thanks :)

am 30. Oktober 2022, 15:59 Uhr von Jesper
A wonderful and very challenging puzzle! I love this series :)

am 30. Oktober 2022, 05:34 Uhr von polar
Insanely smooth puzzle considering the complexity of the rules. Agreed the example is a must! Thank you :)

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