Logic Masters Deutschland e.V.

Dynamic fog, negative digits and negative constraints (XV and white kropki).

Solve in Sudokupad

Wet Blankets (negative digits) series:

Wet Blankets

Wet Blankets 2: Soggy Monday

Rules:

Normal sudoku rules apply. Place the digits 1-9 in every row, column, and 3x3 box.

Dynamic fog: When you place a correct digit in a cell, it clears the fog from that cell, and possibly from some other cells. Guessing is never required.

XV: The values of two digits separated by V sum to 5. The values of two digits separated by X sum to 10.

Kropki: The values of two digits separated by a white kropki dot are consecutive.

Global constraints: All white kropki dots are given. All X and V are also given, but never in a place where a white kropki dot can be placed.

Negative digits: In every row, column, and 3x3 box, one of the digits has a negative value (e.g. 5 becomes a -5). None of the negative digits have the same value.