Logic Masters Deutschland e.V.

This is the third puzzle in my '3 Series'.

I was looking at interesting behaviour of 3 in different puzzle types. Their effect in X-Sums seemed almost too restrictive to make anything proper out of it, so I settled with making a small snack, that does not overstay its welcome. Anyone should be able to solve this, I think most people can manage to do this snack in under a minute with little effort. I hope it's still enjoyable.

Solve on SudokuPad

Rules:

Normal sudoku rules apply.

X-Sums: Numbers outside the grid indicate the sum of the first X digits, where X is the digit in the first cell from the direction of the clue.