Normal sudoku rules apply. Numbers outside the grid are both Sandwich Clues and X-Sum Clues. A sandwich clue shows the sum of digits between the 1 and the 9 in that row or column. An X-Sums Clue shows the sum of the first X digits, where X is the first digit, from that direction. Shaded circles are odd numbers. The grid is partially covered with fog. Placing correct digits will remove the surrounding fog.