New to Pipes? Start with the lessons or the normal game: these puzzles need every technique, “what if” included.
About these puzzles
There are no hints here and no button that shows the solution: the puzzle has exactly one, and every step can be reasoned out. When you are stuck, look for two pieces that would close into an island, or try one turn of a tile in your head.
The techniques are in the lessons No islands and What if.
Very hard: among the hardest twentieth of them; several what-ifs, often one after another.