New Super Mario Bros.: 3-B

This level is a pipe world. Several pipes contain Piranhas or Fire Piranhas. The first Star Coin can be reached by going past it, down a red pipe, going left, then up. Go back right. To reach the second Star Coin, wall jump up the green pipe with the Fire Piranha and the short red pipe. The third Star Coin is under a pipe, but the gap may be too narrow to get while approaching from the left. Go over the pipe, then under it to reach it. Continue to the right to reach the goal, which leads to 3-C.