Easy Homerun:

While batting with Ken Griffey, press Left, Left, Right, Right, Right, Left, Left on the D-Pad. Griffey will point his bat to signal correct entry of this code. Connect with the ball to hit a homerun.

Exploding Batter:

While batting press Right, Left, Down, Right, Left, Up, Right, Left, Down. The batter will reappear after that pitch.

Weeble team:

Create a player named CODE WEEBLEMAN. You'll hear a sound to confirm.

Extra teams:

Create a player named CODE EMOTIONS. You'll hear a sound to confirm.

Big feet mode:

Create a player named CODE BIGFEET. You'll hear a sound to confirm.

Big bat mode:

Create a player named CODE PHATTBATT. You'll hear a sound to confirm.

Invisible team:

Create a player named CODE INVISIBLEMAN. You'll hear a sound to confirm.

Skinny team:

Create a player named CODE TOOTHPICK.You'll hear a sound to confirm.

Tiny team:

Create a player named CODE LIDDLELEAGUE. You'll hear a sound to confirm.

Flat team:

Create a player named CODE STEAMROLLED. You'll hear a sound to confirm.

Big head mode:

Win the World Series at Rookie difficulty. Now create a player named CODE BIGGHEDZ. You'll hear a sound to confirm.

Tick team:

Win the World Series at Veteran difficulty. Now create a player named CODE THETICK. You'll hear a sound to confirm.

CPU vs. CPU mode:

Win the World Series at All-Star difficulty. Now create a player named CODE CPUVSCPU. You'll hear a sound to confirm.