Unlock Midget Players:
     Create a player with one of the following case-sensitive names to
create a midget player:

keegan paterson
jacob paterson
isaiah paterson 

Unlock Legendary Teams:
     Unlock all 25 Legends Team players.

Unlock Heroes Teams:
     Unlock all 25 Heroes Team players.

Unlock Secrets Mode:
     Purchase  all  the  available  Ballpark Upgrades in Owner Mode to
unlock an extra option in the Buy Assets menu.