The Dumbo story is messed up because Dumbo can no longer fly so the challenge, called Save Dumbo, is to set up the clown act so that the clown falls of the burning building and then he makes different obstacles happen so that Dumbo can fly again. The final battle for Dumbo is with the Ringmaster and his clowns who throw pies and bowling pins at you that you have to reflect back with a book.
The extra game for Dumbo is called Clown Fever. Bumpy the clown from Dumbo is a dancer so he allows you to make him dance Freestyle or play Match a Move. In Match a Move you have to mimic the dance moves that Bumpy does.