Logic Masters Deutschland e.V.

Normal sudoku rules apply.
Digits along an arrow sum to the digit in that arrow's circle and can include repeats if allowed by the other rules.
Grey lines are palindromes (i.e., they read the same from both ends).
Pink 2x2 squares are clones. (i.e., 4 digits in R2C2:R3C3 are in the same positions in R7C7:R8C8)
Yellow 4x4 squares are clones. (i.e. 16 digits in R5C2:R8C5 are in the same positions in R2C5:R5C8)

Solve online:
F-Puzzles
CTC

Have fun!