Logic Masters Deutschland e.V.

• Normal sudoku rules apply.
• Doppel-Dög loop:
  • Draw an orthogonal non-branching closed loop that doesn't cross or touch itself, not even diagonally.
  • The loop "starts" at the cell marked with the dog and is considered to be oriented in the direction indicated by the arrow (i.e. r6c6 and r6c7 are in the loop).
  • A cell on the loop with a digit D will have a value equal to the cell D steps away along the loop in the orientation given by the arrow.
  • Cells not on the loop will have a value equal to the digit in them.
• Adjacent digits (not values) along the loop must have a difference of at least 5.
• A cell with a shape (circle, square, diamond) has a value equal to the number of cells with the same shape and value.
• Clues outside the grid show the value sum of loop cells in the indicated row/column.
• Cells joined by a ball have the same value.

Online in Sudokupad

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