How do you get on Boos balcony?

Use the wall kick. This takes practice but good luck.

Do that jumping thing off the wall.

First you go up the stairs inside the Haunted Castle so youre on the second level. Then go to the last door on the right. When you walk in, there should be a platform higher than the floor youre walking on. Jump on that platform and do a wall kick. When you do that, you should see a door up top. Get up there and go through the door, then there will be a big door on your right, go through there, and kill the Big Boo. The star will appear at the top of the castle. From there on I dont know how to get the star because it's to high up. Maybe someone else can answer that.

-Katie

(Continuing from xo_softball_babii_ox's answer)

You'll notice that there are two window on the sides. You must do a long jump to get onto any of them. Then you turn around. Do a long jump to reach the Star and a 1-up.

Well, I did a triple jump onto the wall by the platform, then I did a wall kick...it's not easy though

Simple, go up the stairs, turn right, and go to the end. Open the last door and it will take you into a room where haunted books will try to hit you;defeat the books. Then you will notice a platform on the bottom right side of the screen. Do a wall kick off the pillar that is there, and you'll see another platform with a door in the wall. Open the door and go to the next one(or the only one there), and Boo will be outside. When you defeat Boo, you will notice that the star goes to the top of the balcony. To get there, long-jump to the flat part above the window, and long-jump upwards toward the roof, and try to walk towards the top. If you go over the roof's peak, or if you didn't go to far, well, welcome to Pains ville. And if that does not work, try, try again. To get to the eye, do the same thing, but don't go in the door. Instead, long-jump over to the area with the invisible cap, put it on, and go in the door. Beware of the Flipping Floor and continue with the rest(wall jump off the pillar,etc.), and go in the false wall, and run around the eye inside. Simple, isn't it?