New Super Mario Bros.: 5-A

This level is has more unusual mushroom platforms. These blue mushrooms will  expand and cntract periodically, allowing us to reach certain areas. Before we reach the midpoint, there is a Red Coin Ring. The first Star Coin is under a ledge that we can reach when a blue mushroom expands under it. There is a ! Switch to allow us to get back up. Nearby is a brick block containing a vine that leads to Coin Heaven. Hit the P-Switch, then use the spring to reach the second Star Coin. We then drop back down to the main level. The third Star Coin is over a blue mushroom. We reach the flagpole and a path to the fort opens up.