Logic Masters Deutschland e.V.

Rules

• Normal sudoku rules apply.
• Sum Diamonds: Cells separated by black diamonds sum to 15. Not all diamonds are given.
• Gemma Lines (purple): Digits on the line must not repeat. For each digit on the line, the counter-digit (10 minus X) must also appear on the line.
  
  Example: If 3 is on the line, 7 also appears on the line.
  
  
• Region Sum Lines (blue, thinner): Digits along the line sum to the same value in each 3x3 box the line passes through. Different lines may have different totals.

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