Logic Masters Deutschland e.V.

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

Arrow rules: Digits along an arrow sum to the number in their attached circle.

German Whispers: Neighbouring digits on a thick blue line have a difference of at least 5.

Sudoku X: Each long diagonal must contain all of the digits 1 through 9.

f-puzzles link: https://f-puzzles.com/?id=yjjy2c8l

CtC link: https://tinyurl.com/k8c2rzsm