Logic Masters Deutschland e.V.

My first puzzle with ten-lines - and likely not my last! This came from Scojo's weekly prompts a few weeks back.

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Rules:

- Normal sudoku rules apply.

- 10-lines - Each red 10-line can be entirely divided into non-overlapping segments that each sum to 10.

- Arrows - digits along the stem of an arrow sum to the two digit number in the bulb - the digits in the bulb read from top to bottom or left to right.

- XV sums - digits separated by X sum to 10; digits separated by V sum to 5. No negative constraint.

- Ratio Kropki - digits separated by a black Kropki dot have a ratio of 2:1. No negative constraint.

Sudokupad