Logic Masters Deutschland e.V.

This is a Fog of War puzzle. You can play it on SudokuPad: https://sudokupad.app/wodadzm0c3



Rules: This grid used to be a standard sudoku grid with rows, columns, and 3×3 boxes numbered 1–9: rows from top to bottom, columns from left to right, and boxes in normal reading order (e.g., box 7 is formed by rows 7–9 and columns 1–3).

The grid has been shuffled: the rows and columns have been reordered (so boxes may now consist of multiple disconnected pieces).

Sudoku: Place the digits 1–9 exactly once in each row, column, and box.

Friendly cells: A cell with a gray square shows its box number. A cell with a tall rectangle shows its original column number (before shuffling). A cell with a wide rectangle shows its original row number (before shuffling).

Region sum lines: Box borders (i.e., points between adjacent cells belonging to different boxes) divide each line into segments. Along a single line, all segments must have the same sum (which can differ between lines).

Dynamic fog of war: The grid is partially covered in fog. Placing correct digits will reveal their own cells and may also clear fog elsewhere in the grid. No guessing is required.

Example: