The Train Exhibit Ambush
King Boo is hiding in the train exhibition! You have to take him by surprise and save your brother, Luigi!
First, make the tractor visible and ride a round with it. In the end, you will receive the last gem as a reward.
Then the fight begins. Avoid the attacks from the Big Boo and pull his tongue afterwards. Shoot him against the drill of the locomotive so that he jumps apart. Now you pull on the tongue of the little boos again and shoot one into the box. You have to make the others visible again to shoot them into the box. After a short time the Boos reunite and the game starts all over again. If all Boos are locked up, the mission is over.