Normal sudoku rules apply. The grid is partially covered in fog. The first correctly placed digit on each constraint will remove fog from other cells. Each constraint type may contain no repeated digits anywhere in the puzzle. E.g. If one cell on a parity line contains a 5, then no other cell on a parity line may contain a 5. Constraints: a) Along a red line, adjacent digits must alternate between odd and even; b) Digits do not repeat in cages, and sum to the small clue in the top left corner if given; c) digits in cells separated by a black dot have a 1:2 ratio (ie one is double the other); d) pairs of digits equidistant from the centre of a lavender zipper line must sum to the digit in the middle of that line (noted by a dot); e) digits along a thermometer increase from bulb to tip; f) a cell with arrows pointing inward must be smaller than all other cells that share its edge; and g) a digit in a grey square is even. Each listed constraint type appears at least once in the puzzle.