Pipe Works

A rotate-the-pipes puzzle. A boiler line is a grid of fixed steam-pipe segments, scrambled by rotation. Tap a segment to turn it 90° clockwise. Steam enters at the glowing inlet valve and flows between any two segments whose connectors meet. Seal the whole network — every segment fed from the source, with no open ends — before your wrench turns run out. 10 lines grow from 3×3 up to 6×6.

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