The first Star Coin is located in a hidden area. To find it, enter the yellow pipe at Point 1.
The Star Coin is at the bottom of the room. Use the POW Blocks to clear a path through the area.
The second Star Coin is located in a secret area. To find it, enter the yellow pipe at Point 2.
After you pass through the pipe, search the nearby ? Blocks to find a Gold Flower. Use this power-up to clear a path to the Star Coin, but be careful! If you destroy too many Blocks, you may not be able to reach the Star Coin.
When you pass through the Red Ring at Point 3, eight red coins appear on the platforms to the left.
The third Star Coin is hidden above the platforms at Point 4. Stomp the nearby enemies to bounce up to the lower platforms, then repeat the process to bounce to the upper platforms.
When you reach the top of the stack, collect the Star Coin floating above the pink platform.
To reach the secret exit, you must locate the Invisible Blocks at Point 5. Stand on the blue platform and jump up to reveal a hidden Beanstalk. Climb to the top of the Beanstalk and follow the path to the secret exit. After you reach the Goal Pole, Mushroom-A becomes available on the Map Screen.