Logic Masters Deutschland e.V.

• Normal Sudoku: Place the digits 1-6 in each row, column and box, without repeats.
• Anti-King: Digits a King's move (in chess) apart must be different.
• Fortress: Digits in red Maximum cells are bigger than the up to 4 orthogonal neighbors. Digits in blue Minimum cells are smaller than the up to 4 orthogonal neighbors. (Arrows point towards the smaller digits.)

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