Logic Masters Deutschland e.V.

This is my first puzzle, so forgive me if it's too easy or if I'm not using these lines' logic to their fullest degree.

Place the digits 1-6 in every row, column, and box. Clues outside the grid indicate the sum of the digits along the indicated diagonal. For all overlapping stretches of 3 cells connected along a line, the 2 lowest digits in that stretch must sum to the 3rd remaining digit in any order. Digits on the lines can repeat. The sum cell does not necessarily have to be the same for intersecting stretches of 3 cells: each stretch functions independently. For example, 1 in r1c4, 3 in r2c4, 2 in r3c4, and 5 in r4c5 satisfies the line because in the stretch r1-3c4, 1+2=3 (the middle cell of a stretch can be the sum), and in the stretch r2-3c4

CTC
Fpuzzles

Example of valid combination: 6154132532112352314516