Original URL: http://www.psxextreme.com/ps2-cheat-print/271.html
High Heat Major League Baseball 2004

Cheat mode:

Pause game play and press Square(2), Circle(2), L1, R1. A sound will confirm this portion of the code. Then, press L1 + L2 + R1 + R2. The "Ball Cannon" (set pitch physics) and "Game State" (edit game parameters) options will now be unlocked. 

Note: After using the "Game State" and "Ball Cannon" cheats, if you do not save soon afterwards, your game may freeze. 


Hold Square after your batter is beaned and he will charge the pitcher and start a fight. Your player will be ejected.

Thanks to RamirezXsJ