Normal sudoku rules apply. There are two snakes in the grid, the endpoints of which are given (as circles). Snakes cannot touch themselves or each other orthogonally but they can touch diagonally. Adjacent digits along a snake must differ by at least 5. The non-snake cells form several regions. In regions, digits cannot repeat. Some region totals have been indicated by small corner clues. The given digits indicate the number of snake cells within the 3x3 square centered on that digit.