Logic Masters Deutschland e.V.

Normal sudoku rules apply
Each row, column and 3x3 box contains the digits 1 to 9.

Standard arrow rules apply
Digits along an arrow must sum to the digit in its circle. Digits may repeat along an arrow.

Standard little killer rules apply
The numbers outside the grid show the sum of the indicated diagonal. Digits might repeat along the diagonal if allowed by the other rules.

Standard XV rules apply
Cells separated by a V must sum to 5. Cells separated by an X must sum to 10. Not all possible X's and V's are necessarily given (no negative constraint).

Links
Try the puzzle on:

F-Puzzles
CTC-App