Hit a home run
 
While in the batter's box, hold L1 + L2 + R1 + R2 and 
press Triangle, Square, Triangle, Circle, X, Square, 
Left, Right. If you entered the code correctly, you 
will hear a thump. 

Strike out the batter
 
While on the pitching mound, hold L1 + L2 + R1 + R2 
and press Up, Down, Triangle, Square, Triangle, Circle, 
X, Square. If you entered the code correctly, you will 
hear a thump. 

EA Sports Dream team 
Select "Single Game" from the main menu. Then at the team 
selection screen, press [Left, Right] six times. If you 
entered the code correctly, the phrase "Triple Play Baseball" 
will be spoken. To play as the EA Sports Dream team in Home Run 
Challenge mode, select "Home Run Challenge" from the main menu. 
Then at the team selection screen, hold Up + L1 + R1 until the 
phrase "Triple Play Baseball" is spoken. This team consist of 
the game's developers with super attributes. 

Homerun sounds 
While running around the bases after hitting a homerun, press 
Triangle to hear a soft horn, Square to hear a loud horn, or 
Circle to hear a whistle.

Remove screen display 
While playing a game, hold L1 + L2 + R1 + R2 and press Triangle, 
Up(3) to remove the pitch, name, and stat information from the 
screen. If you entered the code correctly, you will hear a thump.

Extra large stadium 
Enter the player creation screen and enter "YELLOW STONE" as a name. 
This will double the length of the fences from home plate to the 
outfield, and will raise the height of the outfield walls to that 
of Boston's Green Monster.

Control camera 
While playing a game, hold L1 + L2 + R1 + R2 and press 
Right, Left, Up, Down, Right, Left. If you entered the code 
correctly, you will hear a thump. Then, use one of the following 
actions to control the camera:

Action = What It Does 
D-pad = Move 
L1 + D-pad = Move faster 
R1 + D-pad = Turn 
L2 = Zoom out 
R2 = Zoom in 
Triangle = Higher view 
Square = Lower view 

Announcer comments 
Enter one of the following codes while playing a game to hear 
the corresponding announcement. If you entered the code correctly, 
you will hear a thump.

Additional batter information 
Hold L1 + L2 + R1 + R2 and press Left, Square, Up, Triangle.

Historical commentary 
Hold L1 + L2 + R1 + R2 and press Up, Triangle, Right, Circle.

Trivia 
Hold L1 + L2 + R1 + R2 and press Down, X, Right, Circle.

Weather 
Hold L1 + L2 + R1 + R2 and press X, Down, Triangle, Up.