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Snake Pit (348)
Instruction:
Divide the grid along the dotted lines into snakes so that no two snakes with the same area share an edge. A snake is a series of at least two cells that touch orthogonally in sequence. A snake may not touch itself, not even diagonally. (In other words, if two cells in the snake touch orthogonally, then they must be exactly one cell apart along the path of the snake, and if two cells in the snake touch diagonally, then they must be exactly two cells apart along the path of the snake.)
Inside some cells are numbers; each number must equal the area of the snake it belongs to. A snake may contain zero, one, or more of the given numbers. (It is possible to have a “hidden” snake : a snake without any of the given numbers. “Hidden” snakes may have any area, including a value not present in the starting grid, such as a 6 in a puzzle with only clues numbered 1-5.)
Some cells contain circles; a circled cell must be either the head or the tail of a snake. A snake may contain zero, one, or two circles.