Logic Masters Deutschland e.V.

It's been a year since I last set anything, so any feedback is highly appreciated!

Solve on Sudokupad

TEN LINES
– Every line can be broken into one or more continuous segments such that each segment individually sums to 10.
(for example, 1901342 would be a valid line since it can be broken as 190|1342)

COUNTING CIRCLES
– Each digit placed inside a big white circle counts the amount of times that digit appears in a circle.

WHITE KROPKI
– Digits in cells separated by a small white circle are consecutive.

DOPPELGANGER
– Every row, column, and region contains the digit 0 always, as well as eight out of the nine digits from 1 to 9 (ie, it's missing a digit that is not 0).
– No two rows, no two columns, and no two regions may be missing the same digit.
– For each 0 in the grid, the digits missing in its row, its column, and its box must be three different digits, yet zeros always have a null value (ie, zero).