MLB SlugFest: Loaded Cheat List
These cheats work at the versus screen.
* Unlimited Turbo: SQUARE, SQUARE, SQUARE, SQUARE, TRIANGLE, TRIANGLE, TRIANGLE, TRIANGLE, CIRCLE, CIRCLE, CIRCLE, CIRCLE, DOWN
* Softball Mode: SQUARE, SQUARE, TRIANGLE, TRIANGLE, TRIANGLE, TRIANGLE, CIRCLE, CIRCLE, DOWN.
* Ball Is Rubber: SQUARE, SQUARE, TRIANGLE, TRIANGLE, TRIANGLE, TRIANGLE, CIRCLE, CIRCLE, UP.
* Max Out Speed: CIRCLE, CIRCLE, CIRCLE, LEFT.
* More Time After Each Play: SQUARE, TRIANGLE, TRIANGLE, CIRCLE, CIRCLE, CIRCLE, LEFT.
* Big Heads: SQUARE, SQUARE, RIGHT.
* Tiny Heads: SQUARE, SQUARE, LEFT.
* Max Out Batting: SQUARE, SQUARE, SQUARE, LEFT.
* Max Out Power: TRIANGLE, TRIANGLE, TRIANGLE, LEFT.
MLB SlugFest: Loaded Cheat: Fantasy Teams and Stadiums
At the Title Screen or the Main Menu press TRIANGLE, SQUARE, R1 to unlock all Fantasy Teams and Fantasy Stadiums.