Normal sudoku rules apply. All cages have a small “clue” in the leftmost cell of the top row that the cage occupies. Digits in a cage must not repeat and must sum to that cage’s clue. Digits separated by a white dot are consecutive. Digits separated by a black dot are in a 1:2 ratio (ie one digit must be double the other). The grid is partially covered in fog. The fog will clear from surrounding cells when a digit is placed correctly. No guessing is required.