Star 1 - Go on a Ghost Hunt - Big Boo's Haunt

Locate the Boo with the stage inside it in the back garden of the castle. Sneak up from behind and punch it to reveal the entrance to the level. Walk over to the entrance and Mario will jump in.

Upon starting, approach the large haunted house and enter through the front door.

In the main hallway with many doors, enter the first door to your left.

Past the Mad Piano, enter the door at the back of the room. Watch out for flying chairs.

Stand on the table with the Boo poster behind it and look away from the poster to lure out two Boos. Punch them from behind to defeat them.

Exit this room through the back door, which leads back into the main hallway.

Enter the next door to the right of the one you just exited. This room contains a Mr. I and a Boo. Defeat the Boo. To defeat the Mr. I, run around it in circles.

Exit this room the way you came in and proceed through the next door to the right.

Cross the crumbling bridge VERY QUICKLY to reach a small platform with a door. Defeat the Boo on the platform by punching it from behind.

Enter the door to find a small room with a pit. Jump to the next platform and defeat the fifth Boo.

After defeating the fifth Boo, a message will appear indicating you are about to face Big Boo. Return to the hallway with all the doors.

Big Boo will appear in the hallway.

To defeat Big Boo, run behind him and perform a rugby-tackle dive (press B while running) into his back. He will shrink.

Hit Big Boo three times. He gets quicker with each hit, but the task is not difficult.

After defeating Big Boo, the Power Star will appear at the top of the balcony. The platform in the middle of the room will transform into stairs. Climb the stairs to claim your Star.