Hidden teams:
Complete a season, then press A, B, X, Y, Up, Down, Select at the title screen. More teams will appear with longer seasons.

Random pitches:
Pause game play while batting and press L, Y, A, Right, Select. Note: This code will end after the current batter completes his turn at bat.

Super pitch:
Pause a two-player game while pitching and press B, A, Down, B, A, Left(2), Select. Note: This code will end after the current batter completes his turn at bat.

Super team:
Pause game play while batting and press A, Right, Down, Left, A, Down. Each of your players' abilities will be set at the maximum. Note: The effects of this code only lasts for this part of the inning.

Home runs:
Pause game play while batting and press B, Y, B, Y, Select. Note: This only works for the eight players that also appear in Home Run Derby mode.

Toggle day and night:
Begin a game in an outdoor stadium. Press Start to pause game play, press Select, Down, A, Y, Start. The previous time of day will switch to night or day when the camera switches to an overhead view. Note: This code may only be enabled in outdoor stadiums.

Slow opponents:
Pause game play while batting and press Left, A, Right, Down, Y. Note: The effects of this code only lasts for this part of the inning.

Clumsy opponents:
Pause game play, then press A, B, R, L, Y, A, Select to increase the number of errors committed by the opposing team.

View ending sequence:
Press B, A, Down, B, Up, B(2), A at the title screen to view the sequence displayed after the world series has been won.

Hint: Toss the ball to a base:
When you get the ball, get somebody close to the base, press Y or B, then very quickly press the D-pad. You will toss the ball to that base.