Codes:

Hidden fields:
At the stadium selection screen, quickly press L1, R1, L1, R1, Square. The Field Of Dreams cornfield, Ebbets field, and the
Polo Grounds will now be selectable for game play. Note: Ebbets field and the Polo Grounds will appear in monochrome.

EA Sports dream team:
At the team selection screen, press L2 , R2, L2 , R2, Circle. Select the 33rd team on the list. This team consist of the game's
developers with super attributes.

Players in underwear:
Enable the "Hidden fields" and "EA Sports dream team" codes. Select the dream team as the home team and the San Diego Padres as the visiting team. Now the home team will play in their underwear.

Altered players:
Enable the "Players in underwear" code. Then, while the players are in their underwear, hold L1 + L2 + R1+ R2, and press Circle, Triangle, Square, X, X, Square, X, Circle, Triangle. Now various physical features of the players will be altered, such as height, width, head size, and glove size.

Hit a homerun:
While in the batter's box, hold L1 + L2 + R1+ R2, and press Up, Triangle, Left, Right, Square, Circle, Down, X.

Strike out the batter:
While pitching, hold L1 + L2 + R1+ R2, and press X, Down, Circle, Square, Right, Left, Triangle, Up.

Super pitch:
Throw a fastball, then immediately press Square + Down.

Crowd and stadium comments:
While playing a game, hold L1 + L2 + R1+ R2, and press Square, Circle, Square.

Weather comments:
While playing a game, hold L1 + L2 + R1+ R2, then press Circle, X, Circle.

Sponsor comments:
While playing a game, hold L1 + L2 + R1+ R2 then press Triangle, Circle, Triangle.

Crowd cheers:
While playing a game, hold L1 + L2 + R1+ R2, then press Down, X, Down, X, Triangle.

Crowd boos:
While playing a game, hold L1 + L2 + R1+ R2, then press Down, X, Down, X.