Cheat mode
Pause the game and press Triangle, Square, X, Circle(3) on controller two. If you entered the code correctly, you will hear the sound of a piano. Now press one of the following buttons to activate the corresponding cheat function:

Choose inning
Press X, and then the phrase "Let's go to Inning" will appear in the upper left corner. Now press X repeatedly to select the desired inning. Press Start to resume the game.

Automatic home runs
Press L1, and then the phrase "home run" will be spoken. Now press Start to resume the game. Any hits will be home runs. To resume normal batting, enter cheat mode and press L1 again.

CPU vs. CPU
Press L2, and then press Start to resume the game. To resume human control, enter cheat mode and press L2 again.