Every piece of the network is in the wrong place — your job is to rearrange them. Tap one pipe, then tap another to swap them. Pipes never rotate; only their positions change.
Water starts at each handwheel valve (the spoked wheel) and must reach the matching-color collection tank (the container showing a colored dot — it fills up and shows a check when its line arrives). The chevrons on every stub point in the direction the water travels: out of valves, into tanks. A line only flows through pipes of its own color — flowing water shows how far each line currently reaches.
Bridge pieces (+) carry two lines at once: one color runs over, the other runs under, and each arm only accepts its own color. Gray pipes are neutral — any line may pass through them. Pipes in a color with no valve on the board are scrap: nothing can flow through them. Hatched squares are welded shut and can't be moved.
Expert — the mixing chamber. The bolted brass chamber is fixed in place. Feed both of its colored input arms from their matching valves and the chamber blends them (red + green = yellow, red + blue = magenta, green + blue = cyan). The mixed color then flows out of the third arm — route it to the mixed-color tank. Nothing flows out until both inputs arrive.
Finish in as few swaps as possible; beat par for three stars. A new puzzle drops every day at midnight UTC.