New Super Mario Bros.: 2-4

In this level, there are switches that will raise or lower sections of the ground so you can access new areas. The first switch will raise the ground so you can reach the item blocks. As you head right, you'll find the first Star Coin over a horizontal pipe with a Piranha Plant. Wait for the Piranha Plant to retract, then wall jump up to get it. Further to the right is water. In the water, which runs under the ground, to the left is a mini pipe and to the right are more pipes. Go past the red pipe to find the exit. Nearby, to the left is the second Star Coin. Use the switch to reach the platform to get out. To the right is a switch that raises the ground so you can go over the Piranha Plant. You'll find the third Star Coin guarded by two Hammer Bros. Next is the flagpole.