Logic Masters Deutschland e.V.

My cleanest use of the unique arrow rule yet, though fairly easy if you've already done the math from 2.
It's technically possible without the r6c3 light and I prefer that appearance, but proving the break in without them is a 5/5 task inappropriate to the rest of the solve. So I had to compromise aesthetic a bit. At least the rules are properly concise; chuffed with that.

Normal 0-8 Sudoku rules apply.
Fog: The grid is covered in fog. Placing correct digits reveals the surrounding 3x3 area.
Arrows: Digits along an arrow sum to the value in its attached circle.
Unique Arrows: All arrows are a different length. Arrows do not share cells.
X: Digits separated by an X sum to 10.

Non-rule clarifications included for the avoidance of doubt: Arrows move normally (orthogonal or diagonal only) and arrow lines are too thin to be seen in the corner of a cell. Not all Xs are given. No guessing is required.

Play on SudokuPad