Twist Pop: Screw & Nut Sort

Twist Pop is a yarn puzzle about commitment. A woven canvas sits above four docks. Tap a yarn on the canvas and it does not leave alone: every same-coloured yarn connected to it leaves too, all of them into one dock. That dock takes the colour and refuses every other colour until it empties. Six slots per dock, four docks, and no way to put a yarn back. Press a dock that holds yarn while matching tiles are still waiting. The yarn merges into a single thread, and the thread runs across the canvas stitching one tile for every yarn that merged, row by row, until the picture closes.