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How to play
- Every piece is a bit of pipe with openings on some sides. Click or tap to turn it a quarter clockwise.
- Water flows from the source in the middle; connected pipes light up.
- Finish when every piece is lit and no opening is left facing a wall or a blank side.
- The solved network has no loops, so a piece can't connect two ways round.
- Edge pieces can't point outward: start there.
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