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When you win the Backyard World Series the following stadiums will become unlocked.
Big City Stadium:
Win the Backyard World Series.
Super Colossal Dome:
Win the Backyard World Series.
When you win the World Series Mr Clanky will become unlocked as a playable character.
On Season ,create Mighty Monsters gray.Complete a Perfect season with no losses.Then,you'll unlock Babe Ruth,Kenny L o f t o n,Cal R i p k e n JR ,Mark M a g u r i e,and more.(Also you'll unlock Big City S t a t u i m,and Super C o l l s i o l Dome)
If you win the world series you will be able to select the two stadiums that you played in,in the playoffs.
(my team was the all black mighty monsters)
In the batting practice shelf click on MrClanky, go to single game and you can choose him for your team(sometimes MrClanky is not on the shelf).