Logic Masters Deutschland e.V.

Rules:

1. Normal sudoku rules apply.

2. Killer: Digits in a cage must sum to the given total in the upper left corner of the cage.

3. In at least one of the directions on the green lines, each digit must either be twice the previous digit or 9 less than twice the previous digit. It is up to the solver to infer the direction. (For example, on the upper right diagonal 4-cell line, 2-4-8-7 is valid as 2(2)=4, 2(4)=8, and 2(8)-9=7, but 1-2-1-2 is not valid as 2(2) is not 1).

Play on f-puzzles

CTC app link