Bonus stadiums
Hit an out of the park homerun in the indicated location to unlock the
corresponding bonus stadium:
Atlantis: Hit a homerun in AT&T Park.
Coliseum: Hit a homerun in Fenway Park.
Empire: Hit a homerun in Yankee Stadium.
Forbidden City: Hit a homerun in PetCo Park.
Rocket Park: Hit a homerun in Minute Made Park.

Bonus teams
Successfully complete the indicated task to unlock the corresponding team:
Bobble Head: Hit ten homeruns in one game.
Casey: Hit a triple in Wrigley Field.
Dolphins: Hit a homerun in Atlantis.
Eagles: Walk three times in one game.
Gladiator: Hit a homerun in Coliseum Park.
Horse: Steal ten times in one game.
Lion: Hit a homerun with the Lions in Comerica Park.
Martian: Hit a triple in Rocket Park.
Minotaur: Hit a homerun in Forbidden City.
Pinto: Hit a homerun at Busch Field.
Rodeo Clowns: Perform a double play.
Tame Evil Clown: Hit a homerun with a Yankee in Empire Park.