Logic Masters Deutschland e.V.

• Normal sudoku rules apply.
• Shade nine cells so there is exactly one shaded cell in each row, column and 3x3 box. Shaded cells cannot contain repeated digits. If D is a digit in a shaded cell the value of that shaded cell is -D. Values of non-shaded cells are the same as the digit they contain.
• The 3x3 boxes cut each blue region sum line into connected components with the same value sum. (That same sum may differ between different lines.)
• Values in cages must sum to the indicated total. Digits cannot repeat inside a cage.

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