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Author/Opus: This is the 5th puzzle from guest contributor Jonas Gleim.
Rules: (Standard Balance Loop rules.) Draw a single, non-intersecting loop that passes through all circled cells. All white circles must have equal segment lengths on both sides of the circle before turning. All black circles must have unequal segment lengths on both sides of the circle before turning. Numbers indicate the sum of the segment lengths on both sides of the circle.
Also, see this example:
Difficulty: 3 stars
Time Standards (highlight to view): Grandmaster = 3:00, Master = 6:00, Expert = 12:00