Rocket Park Stadium
     When  you  have  picked  your  team  and you opponent then on the
bottom of your screen you should see 3 symbols. Push triangle 3 times,
then  X  2 times, then O 1 time. When you have done that then push any
directional  arrow  on the D-pad and it should say Rocket Park Stadium
on the bottom of the screen.

CheatCodes
     At  the  Match-Up  screen,  press Square, Triangle, and Circle to
change  the  icons  in the first, second, and third boxes. The numbers
below  indicate  the number of times each button is pressed. Press the
D-pad in the specific direction to activate the code.

Log bat:0-0-4 Up 
Wiffle bat:0-0-4 Right  
Mace bat:0-0-4 Left  
Rubber ball:2-4-2 Up  
Maximum speed:0-0-3 Left  
Maximum power:0-3-0 Left  
Maximum batting:3-0-0 Left  
Big heads:2-0-0 Right  
Small heads:2-0-0 Left  
Unlimited turbo:4-4-4 Down  
Tournament mode:1-1-1 Down  
No fatigue:3-4-3 Up  
Rocket Park stadium:3-2-1 Up  
Coliseum stadium:3-3-3 Up  
Pinto Team:2-1-0 Right  
Todd McFarlane Team:2-2-2 Right  
Eagle Team:2-1-2 Right