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or solve online (using our beta test of Penpa-Edit tools; use tab to alternate between Sudoku number entry mode and two drawing modes, Special and Surface, to mark the shape inventory.)
Theme: Snakes on a Sudoku
Author/Opus: This is the 16th puzzle from our contributing puzzlemaster John Bulten.
Rules: Standard Sudoku rules. Also, there are some shapes that must be put into the grid. The shapes can be rotated, but cannot be reflected; they can touch but cannot overlap. (Not all cells of the shapes contain numbers, but all numbers on the shapes must be entered into the corresponding cells after placement.)
Answer String: Enter the 2nd row from left to right, followed by a comma, followed by the 8th row from left to right.
Time Standards (highlight to view): Grandmaster = 10:00, Master = 30:00, Expert = 60:00