Schrödinger's Kropki
Rules:
- Classic Sudoku:
Every row, column and 3x3 box must contain every number from 1 to 9.
- Mystery Kropki:
Two orthogonally adjacent digits separated by a grey dot are either consecutive or have a 1:2 ratio, or both. All dots are given.
Play it online in SudokuPad.
This puzzle is also on Logic Masters Germany.