HOW TO PLAY
Pipe Flow Every tile holds a piece of pipe, and one tile has a gold valve where the water comes in. Tap a tile to turn it a quarter turn clockwise. Link the pipes so water reaches every tile on the board.
Every level can be solved, and a pipe only joins its neighbour when both ends face each other. Filled pipes are bright blue with a solid outline; empty pipes are dull with a dashed outline, so you never need to tell colours apart. Par is the fewest turns that reach the intended layout; you may find a shorter way.
Boards grow from 3 by 3 to 7 by 7 across 25 levels. Hint marks a tile that is still out of place, closest to the water first. With a keyboard press Tab to a tile and Enter to turn it, U to undo, R to restart and H for a hint. Your best turn count per level is remembered on this device only.
Let’s play