Logic Masters Deutschland e.V.

• Normal Sudoku rules: Place the digits 1-9 in each row, column and box, without repeats.
• Renban: Digits on a purple line form a set of consecutive, non-repeating digits, in any order.
• X-Pairs: Digits separated by an X sum to 10.
• Fortress: Digits in red Maximum-cells are bigger than the up to 4 orthogonally adjacent digits. Digits in blue Minimum-cells are smaller than the up to 4 orthogonally adjacent digits.
• Unique digits: Digits in Fortress-cells may not repeat.

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