super mario bros 2 6 3 mushroom world secret exits

you need to unlock the Warp Cannon in World 3. Drop down and wall-kick back up the leftmost opening to reach the coin. There are a total of three Special Worlds in New Super Mario Bros. You'll see openings at the top of the screen wall-kick up the second of these and hit the P-Switch, which will cause the Star Coin to appear in the alcove to your left.

Hit the middle and right switches to open the top path. You will come to an area with three ? Switches and two paths to the right. The last Star Coin is tricky to find, but easy to get to when you know how. Don't worry if you fall and think you've missed it, because a bounce floor will appear under your feet when you're about to hit terra firma. Use these to ascend and hit a ?-Switch, which triggers the appearance of the second Star Coin below you in the lower left. Enter the middle one and you'll find yourself in a room with hidden bounce floors. Once you exit that room, you will see three doors. Push the one on the right, then make your way up the platforms that gradually appear to get the first Star Coin.

There is a switch on either side of the room. At the beginning, go inside the left door.

Super mario bros 2 6 3 mushroom world secret exits