Connect the pipes before the time runs out! The longer the pipe you build, the more you score. Watch out for special pipes - Blocked, Locked, Rusty, Bonus Score and Bonus Time pipes - which will help or hinder you. Then see how you did against the rest of the world on the online hi-score table.
Click on pipes to rotate them in 90 degree increments. Press [Esc] to access the pause menu.