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Author/Opus: This is the 19th puzzle from guest contributor Bryce Herdt.
Rules: Draw a single, non-intersecting loop that passes through all cells. The loop must form a 60 degree angle in all the cells with black circles, a 120 degree angle in all the cells with gray circles, and a 180 degree angle (straight segment) in all the cells with white circles.
Difficulty: 3.5 stars
Time Standards (highlight to view): Grandmaster = 4:15, Master = 7:30, Expert = 15:00
Note: Follow this link for other Loop/Path puzzles.