Logic Masters Deutschland e.V.

Normal sudoku rules apply.

The gray circle is odd.

Digits an equal distance from the center of a lavender line must sum to the digit in the middle of that line.

Each cage is either full of "oil" (even digits), full of "water" (odd digits), or a mix of both. In all cases, each "row" within a cage is of just one type (oil or water). Oil floats on water, so even values will always be in rows above odd values in mixed cages.

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