Pipes Puzzle is the classic rotation puzzle: a grid of pipe segments, all pointing the wrong way, and the job of turning each one until an unbroken route runs from the source to the outlet.
It's a genuinely good logic format because every piece constrains its neighbours. Corner pieces at the board's edge have only one possible orientation, and solving from those constraints outward is far quicker than turning things at random.
Start with the edges and corners, where pieces have the fewest possible orientations, then work outward from what those force.
It's a logic puzzle rather than a race, so the constraint is the solution rather than the clock.
Yes — tap to rotate. Nothing to install.