Logic Masters Deutschland e.V.

Standard Star Killer Sudoku rules apply (see below).

Additional constraints on placement of stars:

• Each star is a fortress clue: The digit in a cell with a star has to be either greater or smaller than all of the 4 adjacent digits.
• The stars in each row, column and box must be a pair of one maximum and one minimum.

Additional constraints on values:

• Renban: Digits on a purple line form a set of non-repeating consecutive digits in any order.
• Kropki: For every cell with a black dot, exactly one of the four neighboring cells is in 1:2 ratio to this cell.
• The grey square is an even number.

Star Killer Rules:
Place exactly two stars into each row, column and box. Stars may not share an edge (no diagonal constraint!). The number in the top-left corner of a cage (if given) gives you the number of stars, that are outside of the cage and share an edge with that cage.
Digits in a cage do not repeat and sum to the total X. The number in the top-left corner of a cage must be equal to the digit sum of X.

Solve online.

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This puzzle is part of a series consisting of 12 puzzles. The series doesn't necessarily has to be solved in the intended order. If you're willing to attempt the whole series you can find part 1 here.

You can continue with part 6 here.