or solve online (using our beta test of Penpa-Edit tools; use tab to alternate between number entry, line drawing, and edge drawing.)
Theme: Noughts and Crosses
Author/Opus: This is the 29th puzzle from guest contributor Joseph Howard.
Rules: Divide the grid along the boundary lines so that every cell belongs to a snake. A snake is a one-cell-wide path at least two cells long that does not touch itself, not even diagonally. Circled cells must be at one of the ends of a snake. A snake may contain one circled cell, two circled cells, or no circled cells at all. Numbered cells must be part of a snake with a length of exactly that number of cells. A snake may contain one number, multiple identical numbers, or no numbers at all. Two snakes of the same length cannot touch each other horizontally or vertically. Cells with an X cannot be an end of a snake.
Also see this example:
Difficulty: 4.5 stars
Time Standards (highlight to view): Grandmaster = 9:30, Master = 14:00, Expert = 28:00