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Pipe Flow gives you pipe segments to rotate until a connected path runs from source to outlet. Every rotation is reversible, so there is no risk — the puzzle is entirely about seeing the connection before you make it.
Look at the board of pipe segments.
Rotate segments to connect them.
Build a continuous path from source to outlet.
All required connections must be complete.
Boards grow and add branches.
Spatial connectivity reasoning — tracing paths through a network. It is the same pattern-tracing as following a wire through a diagram or a route through a transit map.
Start at the source and at the outlet and work towards the middle. Both ends are constrained.
Corner pieces have only two useful orientations in most positions. Fix those first.
Trace the path with your finger before rotating anything. Seeing it is faster than trying it.
Straight pieces in dead-end positions are a sign you have mis-traced the route.
No. Every rotation is reversible, so there is no way to lose a board.
Yes, generated from a known connected layout.
Not always — some boards include spare segments that stay unconnected.
Circuit Builder has you drawing routes into empty space. Here the pieces are fixed in place and only their orientation changes.