Ring Ring
Ring-Ring is a loop-drawing puzzle whose ruleset and first examples were created in 2011 and published in Puzzle Communication Nikoli No. 135, alongside many other original paper-and-pencil genres.
In this puzzle, the solver must draw several rectangular loops—they may intersect or overlap at points, but must collectively cover all cells of the grid. A key restriction is that loop vertices may not lie directly on top of another loop, preventing stacked or ambiguous crossings.
This combination of full-grid coverage and geometric constraints produces a distinct style of reasoning, focused on systematically distributing rectangles while maintaining consistent loop geometry.
In this puzzle, the solver must draw several rectangular loops—they may intersect or overlap at points, but must collectively cover all cells of the grid. A key restriction is that loop vertices may not lie directly on top of another loop, preventing stacked or ambiguous crossings.
This combination of full-grid coverage and geometric constraints produces a distinct style of reasoning, focused on systematically distributing rectangles while maintaining consistent loop geometry.
Rules
Draw few rectangular loops through the centers of unshaded cell so that every unshaded cell is used. The sides of different rectangles may intersect each other, but not turn at their intersections or otherwise overlap.
Click to see the answer.