Logic Masters Deutschland e.V.

Normal sudoku rules apply (each row, column, and 3x3 box must contain all the digits 1 to 9).

Antiknight - cells a knight's move (an L tetromino) apart cannot contain the same digit.

German Whispers - adjacent cells on a redline must differ by at least 5.

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F-Puzzles: https://f-puzzles.com/?id=28qc2a44

Sven's CtC App: https://tinyurl.com/2fv26wjr

Sven's CtC App without personal message so you can also send it to your loved ones on Valentine's Day: https://tinyurl.com/3u553ehy