Logic Masters Deutschland e.V.

Normal Sudoku rules apply. Each row, column, and 3x3 box contains each number from 1 to 9 exactly once.

Arrow Sudoku rules apply. Digits along an arrow in the grid must sum to the digit in its circle. Digits may repeat along the arrows.

Except: The circles and the arrow lines are separated. One circle belongs to exactly one arrow line and vice versa (this is why there are eight circles and eight lines).

Little Killer Sudoku rules apply. Digits along the two indicated diagonals can repeat and sum to X and Y respectively. The sum of these diagonals (X+Y) equals the sum of the digits in the circles.

I advise you to turn off 'highlight conflicts'.

The puzzle is also available online.