Normal sudoku rules apply. Fog is covering the grid. Your task is to remove the fog by placing correct digits in the grid (no guessing is required). Digits along a grey arrow must sum to the digit in that arrow's circle. Along blue thermometers, digits must increase from the bulb end. Cells separated by a white dot must contain consecutive digits. Cells separated by a black dot contain digits in a ratio of 1:2 (one digit is double the other). Not all dots are necessarily given.