Logic Masters Deutschland e.V.

Place the numbers from 1 to 9 in some cells such that no number repeats in a row or column. Clues outside the grid indicate the sums of connected groups of numbers in the respective row or column, in order, where empty cells serve as delimeters between groups. A question mark indicates any digit from 0 to 9, but no clue may have a leading zero.

Mark exactly two cells in each row and each column of each 6x6 quadrant. No marked cell may be empty. Within a quadrant, all marked cells share the same property. Marked cells in different quadrants have different properties. It is up to the solver to determine which property is associated with which quadrant.

The four possible properties for a marked cell are listed below:

1, Cave: A number in a marked cell indicates the amount of numbers seen in all four orthogonal directions (including itself), where empty cells and the edge of the grid obstruct vision. Quadrant boundaries do not obstruct vision.

2, Minesweeper: A number in a marked cell indicates the amount of numbers in the 3x3 area centered at the marked cell. The cell itself is included in the count.

3, Canal View: A number in a marked cell indicates the amount of empty cells that are horizontally or vertically attached (in a straight line) to the marked cell.

4, Island: A number in a marked cell indicates the amount of numbers that are in the same orthogonally connected group of numbers as the marked cell.

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