Tubba Blubba's Castle is a castle at the east of Gusty Gulch.
Inside the castle are Clubba's, which roam the castle as guards. They are all always asleep, until you walk near them, to which they run at you. There are also Sentinel's, which will pick you up and kick you out the castle if caught. In the basement of the castle is also a Boo from Gusty Gulch.
Your goal is to find 3 hidden Castle Key's, which can be found in the castle.
On the third floor, in the right room, is Tubba Blubba's room.
If you get in to a fight with Tubba Blubba, there is no way you can hurt him.In front of Tubba Blubba's bed there is a key named Yakkey that is used for opening the door to Windy Mill. Inside is Tubba Blubba's weakness.
To get a secret badge in the castle you have to:push a grandfather clock to the side,open a drawer,jump on the other drawer,get on the bed, then go on the shelfs, jump on the books, get on another shelf, and go to the left of the shelf to get the Mega Rush badge.