Logic Masters Deutschland e.V.

Rules

Normal sudoku rules apply: fill the grid with digits 1–9 so that no digit repeats in any row, column, or 3×3 box.

All variant clues follow their standard meanings; full descriptions are provided below.

• Dynamic Fog: The grid is covered with fog; entering correct digits may clear fog elsewhere, and no guessing is required. Unless revealed, no additional clues should be assumed to exist under the fog.
• Kropki Dots: A black dot indicates one digit is exactly double the other, while a white dot indicates the digits differ by 1.
• X / V Sums: An X between orthogonally adjacent cells indicates the digits sum to 10, and a V indicates the digits sum to 5.
• German Whispers: Along a green line, adjacent digits differ by at least 5.
• Modular Line: Along a teal line, any three adjacent digits must include one digit from each of the modulo‑3 sets {1,4,7}, {2,5,8}, and {3,6,9}.
• Nabner Line: A yellow line cannot contain two digits anywhere on the line that are consecutive.
• Maximum Cells: Cells indicated by greater‑than symbols, must contain a digit greater than all of its orthogonally adjacent neighbours.