Logic Masters Deutschland e.V.

This puzzle puts a different spin on the knight's move constraint. I hope you enjoy!

Rules:

1. Normal Sudoku Rules apply.
2. Arrows: Digits along an arrow sum to the digit in the corresponding circle.
3. Knight Neighbors: Some cells contain red cages. If a digit is in a red cage, it indicates the number of unique digits that are within a knight's move.

Here is an example. Note that the digit in the cage does not count toward the number of unique digits.

And here is the puzzle. You can also solve online at f-puzzles