Logic Masters Deutschland e.V.

Japanese Sum Cave Cipher #12: Pentominous

(Eingestellt am 26. Januar 2023, 04:41 Uhr von KNT)


This puzzle is a combination of a cryptic Japanese Sum Cave and a Pentominous, with one grid lying on top of the other.

Japanese Sum Cave: Clues outside the grid give the sums of connected digits between empty cells in the correct order. No digit may repeat in a row or column. Same letters stand for same digits, different letters for different digits, and ? stands for any digit 0-9, but no clue may have a leading zero. (Point of clarification: Digits placed in the grid are 1-9). The filled cells of the Japanese Sums puzzle form a cave: all filled cells are connected and every empty cell is connected to the edge by other empty cells.

Pentominous: Every uncircled cell in the grid must belong to exactly one pentomino, and no two pentominos of the same shape may touch. Rotations and reflections of the same pentomino are the same shape.

Interaction: For all circled cells, the letter corresponding to its digit indicates the shape of the pentomino at that location. If a circled cell has no digit, then no pentomino may enter the cell. Clarification: the only cells that may not have pentominos are empty circled cells.

Example: If R1C3 is is a 7, and T=7, then R1C3 must belong to a T pentomino.

Note: Two of the twelve pentominos do not have digit assignments, but these pentominos may still appear in the Pentominous. Each digit from 0-9 is assigned exactly one letter, as standard.


It may be useful to study (or solve) the example presented below. This puzzle uses digits from 1-6, and letters may only replace values from 0-6. It can be solved here.


Below are the two grids corresponding to the main puzzle:

An online solving link that contains both grids side by side can be found here. Answer check is just on digits in the Japanese Sums. For those that need a refresher on which pentomino is which letter, an image below is provided:

Lösungscode: Row 9 of the Pentominous, then Column 8 of the Japanese Sums, S for empty cell.

Zuletzt geändert am 3. Februar 2023, 19:12 Uhr

Gelöst von Vebby, polar, Xendari, the_cogito, Niverio, Jesper, Koalagator2, MagnusJosefsson, cdwg2000, jkuo7, RJBlarmo, ibag, Statistica, stayal, Myxo, Alex, wooferzfg, Jakhob, ONeill, rmn, Jaych
Komplette Liste


am 12. Februar 2023, 03:33 Uhr von ONeill
Gorgeous puzzle, it was not so easy for me either, but very enjoyable nonetheless. Thanks :)

am 10. Februar 2023, 06:46 Uhr von wooferzfg
A slow and steady solve with a lot of fun deductions throughout. The example puzzle wasn't a pushover either! Thanks for the wonderful puzzles.

am 9. Februar 2023, 07:00 Uhr von Alex
Another great one!

am 4. Februar 2023, 18:58 Uhr von Myxo
Amazing puzzle, as usual. Unlike other people, I found this one to be more difficult than most of the puzzles in this series so far.

am 3. Februar 2023, 19:12 Uhr von KNT
Fixed rules in example puzzle link. Thanks @stayal!

am 31. Januar 2023, 20:51 Uhr von stayal
First time I've tried a linked grid puzzle and I loved it! Long solve but every bit of logic was progressive and genius.

am 31. Januar 2023, 20:50 Uhr von stayal
First time I've tried a linked grid puzzle and I loved it! Long solve but every bit of logic was progressive and genius.

am 29. Januar 2023, 21:43 Uhr von ibag
Sehr schön mal wieder!

am 27. Januar 2023, 11:41 Uhr von MagnusJosefsson
Fantastic puzzle! Very fun and creative combination.

am 26. Januar 2023, 22:35 Uhr von Jesper
Loved it, great addition to the series, thanks!

Zuletzt geändert am 26. Januar 2023, 22:34 Uhr

am 26. Januar 2023, 21:07 Uhr von Niverio
UwU quality puzzle.

am 26. Januar 2023, 14:09 Uhr von Xendari
amazing puzzle, U WU is my favourite clue of the series

am 26. Januar 2023, 06:27 Uhr von Vebby
Superb idea to incorporate pentominoes! A long, enjoyable solve. I'm all for more linked grid puzzles in the series :)

Zuletzt geändert am 30. Januar 2023, 23:09 Uhr

am 26. Januar 2023, 04:23 Uhr von KNT
This may look like insanity with the two grids, but tester feedback is that this puzzle is actually one of the most straightforward to solve in the series since #1, despite being a little long. I know there is interest in these by many, but some solvers may be (understandably) intimidated, but I think this should be fairly accessible if you are even a little familiar with these genres.

Also, for each in this series, the examples are not just diagrams, they are real, tested puzzles, and I would feel comfortable posting almost all of them as standalones. So, once again to those interested, but maybe without the full confidence to take on the real ones, the example puzzles should provide adequate fun as well, at an easier level.

Bewertung:100 %
Gelöst:21 mal
Beobachtet:3 mal

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