Connect every pipe and power every bulb.
Network fully powered.
Tap or click a tile to rotate it. Connect every pipe and light every bulb — that's the whole game. Stuck? Undo and Restart are right in the toolbar, and every puzzle is guaranteed solvable.
Mouse: click rotate · right-click rotate the other way · middle-click lock a tile in place. Touch: tap rotate (the ⟳/⟲ button sets the direction) · hold a tile to lock it. Keyboard: ← ↑ ↓ → move · Space rotate · Z the other way · L lock · Ctrl+Z undo · R restart · N new puzzle.
Solve within 2× par for ★★★ and within 3× par for ★★ (an undo counts as one move). Beat the time target for a bonus ⚡ — the timer starts on your first move and pauses while the tab is hidden. Faint red caps mark pipe ends that aren't connected yet. Turn on Wrap-around and the board becomes a loop: the top edge meets the bottom, the left meets the right, so nothing can point "off" the board and a dashed seam marks where it joins. Your boards, records, and settings save locally, so refreshing resumes your game. Replay the intro any time with Tutorial.