Normal sudoku rules apply. The grid is partially covered in fog. Correctly placed digits will remove fog from surrounding cells. Guessing is not required or recommended. Draw a one-cell wide snake of orthogonally connected cells that does not branch or touch itself. The non-snake cells must form a single, orthogonally connected area. No 2x2 region can be entirely snake or entirely non-snake. Digits separated by a white dot are consecutive. Cells separated by dots will contain one snake cell and one non-snake cell. The 3x3 box borders divide the snake into segments, each of which have the same sum.