Logic Masters Deutschland e.V.

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Sudoku

• Fill the grid with the digits 0–9.
• Every row, column, and box must contain each digit 0–9 exactly once.

Fortresses

• A maximum (orange) fortress contains a digit that is greater than the value of each orthogonally adjacent cell.
• A minimum (blue) fortress contains a digit that is smaller than the value of each orthogonally adjacent cell.

S Cells

• Exactly one S cell appears in every row, column, and box.
• An S cell contains two different digits.
• Both digits count individually toward the Sudoku requirement that every row, column, and box contains each digit 0–9 exactly once.
• For fortress constraints, the value of an S cell is the sum of its two digits.
• No fortress can be an S cell.