Matching the colours is the easy bit. The awkward part comes when a nearly full spool leaves you with nowhere sensible to put the next few strands, forcing a rethink of the whole sequence. It has a relaxed pace, but the little mistakes can pile up surprisingly fast.
The full version is unlocked, with Free Booster available to help when a puzzle gets cramped. No ads or in-app purchases getting in the way, just a straightforward set of yarn puzzles to work through.