Logic Masters Deutschland e.V.

After I made my Narrow Cave Deconstruction puzzle, I wanted to explore other combinations of deconstruction with shading puzzles. Here is something I made with rules adapted from the nurikabe genre. After setting 90% of the puzzle, I spent several days of unsuccessful struggle to find a valid grid without given digits, I finally settled on that one, with a given 7 and a funny thematic rule (a kind of compass looking clue that looks nice on the completed archipel map). These helped me conclude the setting, while keeping the main pieces of logic intact. Testing feedback placed the difficulty between 4 and 5. I hope you enjoy !

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.

- Nurikabe : the whole 11x11 grid must form a valid nurikabe grid, that is shade some cells in the grid so that all shaded cells (water) are orthogonally connected, and no 2x2 area may be entirely shaded. Unshaded cells form groups of orthogonally connected cells (islands).

- Clues : Cells with clues in the top left corner are unshaded. Each island contains exactly one clue. The clue shows the sum of the digits contained in the cells of the island. Not all cells of an island must necessarily contain digits. The size of an island is the total number of unshaded cells forming that island (including unshaded cells without digits). Each island must contain its size as a digit. No digit can repeat on an island. The "?" stands for any positive integer.

- R6C6 must have an opposite parity to the 4 orthogonally adjacent cells, if these cells contain digits.

Do try the following example puzzle :

Play on Penpa

Play on Sudokupad