Ninefold Aqueduct

Pressure trial: pump water segment by segment, with only the pipe at the water front available to rotate. Wet pipes lock until undo. Three leak strikes drain the tank. This adds staged repair and resource-risk decisions.

Rotate all nine pipe elbows and straights to make one sealed inlet-to-outlet route through every square.

Tap or click the controls. Keyboard: Tab and Enter/Space operate every button; arrows/WASD move where available, R restarts, Z undoes calm puzzles.

Mistakes remain revisable. Unlimited undo and restart recover deadlocks.