Lure the Broozer at Point 2 down from the ledge, then make him break through the small wall on the left. Go through the new opening to find a hidden door leading to a tall room. Go up the room and enter the door at the top on the left. When you reach the exit, drop down and, instead of passing the flag, go through the second door at the bottom to find the Star Coin.
Hit the Roulette Block at Point 3. The floor gives way underneath you and sends you plummeting down the tall building. As you drop, follow the coins to avoid the Boos. At the bottom scurry to the upper right door to exit!
This room is a great challenge. Get to the platform with eight coins on it and hit both Blocks to make vines grow. Climb the vines, jumping up them to avoid Boos.
Hit the P Switch and jump platforms until you can hit the Block to make a third vine appear. Climb it and run across then jump to the door at the top.
Watch out for the ravens and the Boo as you approach the flag. The ravens will swoop down and zoom in on you before you know it!