Join the twins. Fill every tile.
Drag glossy tubes between twin Dotlings until every tile is full. 204 boards with exactly one answer each, across seven places: square ponds, six-sided honeycombs, overpasses where bridges carry two lines, hedge gardens, burrows whose tunnels wrap round the edge, amber hives with three-way bridges and the Grand Knot. Plus a Daily Knot, Knot Rush for the leaderboard, a bead shop, a Dotling album and trophies. Free hints, no timer.
Join every pair of twin Dotlings with a line and fill every tile on the board; each of the 204 boards has exactly one answer. Drag from a Dotling to its twin, or pick up any line where it stops; crossing another line cuts it when you lift. Later places add hex tiles, bridges that carry lines over and under, hedges you must go round, and tunnels where a line dragged off one edge comes out on the other. Undo, Clear and free Hints are below the board; Knot Rush is two minutes against the clock for the leaderboard.