Click a pipe to turn it · arrow keys move, space turns
Somebody has knocked every pipe on the board out of alignment. Click or tap a piece to turn it a quarter turn clockwise, and keep turning until an unbroken run of pipe joins the tank on the left to the drain on the right. Water fills the pipework as soon as it is connected, so the blue shows you exactly how far you have got and where the run gives up. You have three minutes, and each board you join scores a point; the boards grow from 5 by 5 up to 8 by 8 as you go, with more dead-end branches thrown in to waste your turns.
Work from the tank outwards rather than fixing whatever catches your eye — following the water means every piece you turn is one you actually need. Straight pipes have only two orientations, so if one is already horizontal and the water is flowing sideways, leave it alone. The branches that go nowhere are deliberate: a tee piece pointing into a dead end is not necessarily wrong, because the same piece may also be carrying the run you need. If a board defeats you, skip it — it costs you the point but not the clock, and a fresh board is often quicker than untangling a bad one. Your best three-minute run is saved in this browser.