Logic Masters Deutschland e.V.

Rules:

1. Normal Sudoku rules apply.
2. Palindromes: Grey lines are palindromes, i.e., they read the same in both directions.
3. Arrows: Digits along arrows sum to the digit in its circle.
4. Killer: Digits cannot repeat inside cages, which show their sums.
5. Little Killer: The clues outside the grid show the sum of the indicated diagonals, which may contain repeats.