Untangle Rings Master

Each level here is a cluster of interlocking rings, and every ring is split into colored segments that don't line up yet. You spin the rings against each other until matching colors sit next to matching colors all the way around, which sounds easy until you realize turning one ring throws off three others you'd already fixed. It's a quiet, screen-tap kind of puzzle, no timer pressure, just the slow process of working out which ring to leave for last.