Rules: Draw a closed loop passing through centres of all cells horizontally or vertically. The loop passes straight through all circled cells. The number of turns the loop makes in every visited region is constant across the grid.
Edit: The loop visits all cells. This was not mentioned in the ruleset.
Edit: The loop visits all cells. This was not mentioned in the ruleset.
I see at least two extremely small solutions here. Are you sure you're not missing something in the rules?
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