Normal sudoku rules apply. Kropki: Digits in cells separated by a black dot have a 1:2 ratio (ie one digit will be double the other). Killer: Digits do not repeat in cages, and sum to the small clue in the top left corner if given. Thermo: Digits along a thermometer must increase from the bulb to the tip. Dutch Whispers: Along orange lines, digits must differ from their neighbors by at least 4. German Whispers: Along green lines, digits must differ from their neighbors by at least 5. Parity: Along a red line, adjacent digits must alternate between odd and even. Each constraint type above may contain no repeated digits anywhere in the puzzle. E.g. If one Thermo contains a 5, then no other Thermo may contain a 5 etc. The grid is partially covered in fog. Correctly placing digits will clear the fog around that cell. No guessing is required.
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