In the Big Boo stage, you need to beat the first BIG BOO before you can get up, but if you do this way, you can go for the other stars without beating him. First go to the main room of the BIG BOO stage. Then do a triple jump to the left( make sure you jump left near the stairs part). You needed to jump where the floor for the second floor like a wall. When you touch the wall, press A so you bounce off the wall. While you stay in the air, tilt forward so you have a better chance of going to the top. Once you land, you can find more stars like the second BIG BOO and 8 red coins.