Logic Masters Deutschland e.V.

• Place the digits 0-9 once each in every row, column, and 3x3 box. To achieve this, one cell in each row, column, and box must contain two digits.
• Schrödinger's Fortress: For any cell in the grid that contains two digits, one of the digits must be greater than all of the digits in orthogonally adjacent cells, and the other digit must be lower than all of the digits in orthogonally adjacent cells.
• Cages: Digits in a cage sum to the total in the top left corner of the cage.

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