Logic Masters Deutschland e.V.

Originally published as part of Sudokuvania: Digits of Despair.

Rules:

Sudoku - place digits from 1-9 into each cell without repeating in a row, column, or 3x3 box.

Antikropki - Orthogonally adjacent digits may not be in a 2:1 ratio (i.e., one being double the other).

Antiwhisper - Orthogonally adjacent digits may not differ by 5 or more if either digit is in a gray cell.

Play the puzzle on Sudokupad

I hope you enjoy the puzzle! :-)