Logic Masters Deutschland e.V.

Rules:

• Normal sudoku rules apply.
• In cages, digits must sum to the small clue in the top left corner of the cage.
• A clue outside the grid shows the sum of the digits along the indicated diagonal, which can repeat if allowed by other rules.
• Digits in a Quadruple circle must be placed at least once in the four cells touching that circle.
• Digits along each of the marked lines (the red "3" and blue "7") must add to 37, and can repeat if allowed by other rules.

Links to online solving tools:

• F-Puzzles
• Cracking The Cryptic