In a two-player game, pause the game when you're at bat and press B, Y, B, Y, and Select.
If you hit a fair ball doing this at bat, it will count as a homer.
In an outdoor stadium, pause the game and press Select, Down, A, Y. Once the game
view changes, day will turn into night or night into day.
Hidden Teams
At the Title screen, press A, B, X, Y, Up, Down, and Select. The longer the season
completed, the more teams you'll have to choose from.
Max Ability
Pause the game, press A, Right, Down, Left, A, Down, and Select.
Slow Down
Press Left, A, Right, Down, Y, and Select to slow the game down.
Random Pitches
Press Left, Y, A, Right, and Select to randomize the opposing pitcher's throws.
Super Pithes
Press B, A, Down, B, A, Left, and Select to get super fast pithes!
Home Run
Press B, Y, B, Y, and Select. If you get hit and the ball is fair, you get a home run!