Jikkyou Powerful Pro Baseball 6 Bonus stadiums
At the stadium selection screen, press C-Up, C-Left, C-Right, C-Up, C-Right(2), Z, C-Left, C-Right, C-Left, C-Right, Start.
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At the status screen, press C-Up(2), C-Down(2), C-Left, C-Right, C-Left, C-Right, Start.
The image featured at the top of this post is ©The Legend of Heroes: Trails of Cold Steel III key art / Original