This is, in my opinion, a better rendering of the idea explored in Puzzle #139. This puzzle is difficult throughout, but has a fully logical solution path.
Rules
Draw a single non-intersecting loop through the centres of some cells that passes through every circle. The loop must turn on black circles and travel straight through the cells on either side of the turn. The loop must go straight through white circles and turn in at least one of the cells on either side.
Difficulty: 9/10
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