Pipes 15×15: the large board
Two hundred and twenty-five tiles: a puzzle to settle into. Pin the tiles you are sure of, so that a stray click cannot turn them, and keep an eye on the lamp counter above the board.
Large boards reward method: finish one region before you start the next, and look for groups of pipes with only one way out.
Rules
Click a tile to rotate it. The puzzle is solved when the pipes form one network from the pump to every lamp, with no pipe pointing at nothing and no closed loop. Water shows how far the pump reaches, and the counter above the board shows how many lamps are lit.
Mouse and keyboard
- Click: rotate clockwise; Ctrl+click: rotate back.
- Right click: pin a tile you are sure of; a pinned tile does not rotate.
- Keyboard: arrows move the cursor, Space or Enter rotates, P pins, Ctrl+Z and Ctrl+Y undo and redo.
Touch screen
- Tap: rotate.
- Long press: pin a tile.
- The Pin button under the board swaps the two: a tap pins, a long press rotates.