Connect each matching pair
Drag from a colored dot to the other dot of the same color. A path can turn as often as needed, but each move must go to a horizontally or vertically adjacent cell.
Fill the entire board
Connecting every pair is only part of the solution. The puzzle completes when all matching pairs are linked and every grid cell is covered by a path.
Revise routes freely
Backtrack along your current path to shorten it, or redraw from its endpoint. If a route blocks another color, revise the routes until they fit together without leaving gaps.
Aim for a clean solution
FlowD rewards deliberate routing. Completing a board without restarting a path earns its star, so scan the open space before committing to longer turns.