a number of different pipe shapes (l-bends, t-pipes, straight, etc.) are represented in the game. leaky pipes can only be added to the end or over the last piece of another player's pipeline, and players cannot add to their pipeline until leaks are repaired. leaks are repaired by either placing an intact pipe of the same shape over the leak or placing a wrench on the leak card. repaired pipes cannot leak again. play proceeds clockwise and new cards are drawn after cards are played. players always have the option of exchanging a single card rather than playing a card.