Logic Masters Deutschland e.V.

Originally published as part of Sudokuvania: Digits of Despair.

Rules:

Enlightningment by Skeptical Mario

Sudoku - Place digits from 1-9 in each cell without repeating in a row, column, or region.

Chaos construction - The regions are nine groups of nine orthogonally-connected cells which do not overlap and whose positions must be deduced.

There are three types of clues in the grid: zipper line, German whisper line, and ratio Kropki; see below for rules. For two of these clue types, each clue resides entirely in the same region (never crosses a region border). For the third type, adjacent cells on the clue are in different regions (always crosses a region border). A line following this rule can have multiple cells in the same region as long as each cell on the line is in a different region from its neighbours.

Ratio kropki - Black dots separate digits where one digit is double the other. Not all dots are given.
German whispers - Adjacent digits along a green line must differ by at least 5.
Zipper line - Digits an equal distance from the center of a red zipper line sum to the digit in the center of the line.

Play the puzzle on Sudokupad

I hope you enjoy the puzzle! :-)