Logic Masters Deutschland e.V.

Normal Sudoku rules: Every row, column and box must contain the digits 1-9.

Knight's constraint: Digits separated by a Knight's move in chess must be different.

German Whispers: Neighbouring digits on a coloured line must differ by at least 5.

Diagonal Kropki: Black circles act like diagonal kropki dots. Each pair of digits on a diagonal must be in a ratio of 2:1.

Odd/Even: A grey circle indicates an odd digit. A grey square indicates an even digit.

Alternate version: After the break in, if you want a more pure Knight's move challenge you can ignore the German Whisper in box 5.

f-puzzles link: https://f-puzzles.com/?id=y4xu7aw7

CtC link: https://tinyurl.com/mr4fcuuk