MLB Slugfest 20-04:
Enter these codes when the match-up screen appears as your game is loading by pressing Square, Triangle, and Circle the required amount of times shown in the Parenthesis (#) below. Square changes the first position, Triangle changes the second position and Circle changes the third position. Also make sure to press the direction listed after inputting the code.
Example: For No fatigue press Square 3 times, Triangle 4 times, Circle 3 times then Up
No Fatigue: 3-4-3 Up
No Contact Mode: 4-3-3 Left
Unlimited Turbo: 4-4-4 Down
Bone Bat: 0-0-1 Up
Blade Bat: 0-0-2 Up
Maximum Speed: 0-0-3 Left
Ice Bat: 0-0-3 Up
Mace Bat: 0-0-4 Left
Wiffle Bat: 0-0-4 Right
Log Bat: 0-0-4 Up
Spike Bat: 0-0-5 Up
Maximum Power: 0-3-0 Left
Little League Mode: 1-0-1-Down
Dolphin Team: 1-0-2 Down
Dwarf Team: 1-0-3 Down
Minotaur Team: 1-1-0 Down
Tournament Mode: 1-1-1 Down
Scorpion Team: 1-1-2 Down
Gladiator Team: 1-1-3 Down
Sub-Zero Team: 1-2-2 Down
Extra Time After Plays: 1-2-3 Up
Rodeo Clown Team: 1-3-2 Down
Bobble Head Team: 1-3-3 Down
Small Heads: 2-0-0 Left
Big Heads: 2-0-0 Right
Pinto Team: 2-1-0 Right
Evil Clown Team: 2-1-1 Down
Horse Team: 2-1-1 Right
Eagle Team: 2-1-2 Right
Lion Team: 2-2-0 Right
Oshlan Team: 2-2-2 Down
Todd McFarlane Team: 2-2-2 Right
Rivera Team: 2-2-2 Up
Alien Team: 2-3-1 Down
Napolitano Team: 2-3-2 Down
Casey Team: 2-3-3 Down
Softball: 2-4-2 Down
Rubber Ball: 2-4-2 Up
Maximum Batting: 3-0-0 Left
Extended Time for Codes: 3-0-3 Up
Midway Park Stadium: 3-2-1 Down
Atlantis Stadium: 3-2-1 Left
Empire Stadium: 3-2-1 Right
Rocket Park: 3-2-1 Up
Monument Stadium: 3-3-3 Down
Forbidden Stadium: 3-3-3 Left
Terry Fitzgerald Team: 3-3-3 Right
Coliseum Stadium: 3-3-3 Up