Logic Masters Deutschland e.V.

Blind spot [Narrow Cave Sudoku Deconstruction 9x9]

(Eingestellt am 23. November 2023, 14:00 Uhr von Christounet)

Here is the full size puzzle I made with this ruleset, following the small one I published here previously. If you are not familiar with the way of solving this, I encourage you to try this small puzzle before, or take a look at the diagram (with 2x2 regions) at the bottom of this page, demonstrating the rules and suggesting ways of notating the deconstruction (cages, circles, crosses) to avoid a confusing double coloring with the cave shading.

The puzzle :

Play on Penpa

Play on Sudokupad

Rules :

- Normal sudoku deconstruction apply : Fill the grid with 9 non-overlapping 3x3 square regions, such that each region contains the digits 1-9 once each and no digit repeats in any row or column. Cells outside regions do not contain digits.

- Narrow Cave : the whole 11x11 grid must form a valid cave : shade some cells in the grid so that all shaded cells (the walls) are orthogonally connected to the edge of the grid, and all unshaded cells (the cave) form an orthogonally connected area. No 2x2 block may be entirely unshaded.

- Clues : numbers in the top left corner of a cell are ambiguous clues.

- If a clue is in an unshaded cell (cave), it indicates the sum of the digits that are seen in all orthogonal directions from this cell. The cell with the clue counts once in this sum. Walls obstruct the view. Within the field of vision of a clue, digits may not repeat.

- If the clue is in a shaded cell (wall), it indicates the number of cells of that area of orthogonally connected shaded cells. There can be any amount of clues in each area of orthogonally connected shaded cells, including none.

Diagram of a deconstruction inside a narrow cave grid :

Lösungscode: Column 10 of the grid. For each cell : if it is in a region, the value of the digit in the cell; if it is outside of a region, its shading (S for shaded, U for unshaded). For the exemple diagram, column 4, it would be : 4321U

Zuletzt geändert am 4. April 2024, 10:16 Uhr

Gelöst von Agent, lerroyy, Bellsita, Tom-dz, halakani, Koalagator2, h5663454, KNT, Mr_tn, Leaub, Sewerin, Jesper, wand, Myxo, Playmaker6174, amarins, ONeill, JohnWZA, peacherwu2, rmn, MorganLeah, NightDog, jkuo7, SterlingWest, tonald, Lavender Gooms, MagnusJosefsson, BeeBoi, Piatato
Komplette Liste


am 3. Mai 2024, 11:43 Uhr von Piatato
Very nice! Lot's of great logic! Not always easy for me to spot, but very satisfying once found :)

am 26. April 2024, 06:31 Uhr von Piatato
@Mr.CHEN Certainly it's up to the solver to find the correct solution?

am 26. April 2024, 05:04 Uhr von Mr.CHEN
I hope these CTC links can add answer verification so that the timer can stop in time to determine the record and prevent errors (I don't know if this is a problem caused by penpa to CTC conversion, but some penpa to CTC links also have answer verification)

am 2. April 2024, 18:20 Uhr von MagnusJosefsson
Brilliant! Lots of cool small deductions. Quite challenging, but comes together in a very satisfying way!

am 26. November 2023, 18:38 Uhr von ONeill
Very nice :)

am 26. November 2023, 00:20 Uhr von Playmaker6174
Beautiful puzzle with lots of interesting deductions all over! Precise scanning really did help a lot in here :)

am 26. November 2023, 00:14 Uhr von Myxo
Awesome puzzle! That really broke my brain a couple of times.

am 24. November 2023, 22:32 Uhr von Jesper
Lovely, thanks!

am 24. November 2023, 05:37 Uhr von KNT
wow, extremely intricate puzzle!

am 23. November 2023, 17:26 Uhr von lerroyy
Very nice, thanks!

am 23. November 2023, 14:11 Uhr von Agent
Great puzzle and ruleset, very smooth and satisfying resolution!

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