Get the superteam dingers
To get the superteam dingers in batting practice go into batting practice. Next go to the player select. All at once press R1 + R2 + L1 + L2. If you do this right the screen should switch to the dingers team.

Extra squads
To unlock the Dingers and the Islanders, and to have them under the 1990's teams, enter the exhibition mode. After that, repeat pressing L2 + R2 until you hear a sound.

Always steal second base
Get a baserunner on first and third base. Attempt to steal second base and the CPU will always throw to third base.

Super fastball
Pitch with Randy Johnson and select his fastball. Aim it as low as it can go in the strike zone. Hold X (his fastball) and bring it up towards the middle of the strike zone. The pitch will as fast as 100 to 105 mph.

Mr. Met
If you play at Shea Stadium. In between innings you would see Mr. Met dancing on top of the Mets Dugout.

Aluminum bats
To get aluminum bats enter in the cheat area: Hollow bats. Now aluminum bats will be available.

Extra Jerseys
In exhibition mode press L1+L2 at the same time to enable alternate jerseys.

Easy Stealing
Whenever you have a man on 1st and 3rd steal 2nd because your opponent always will throw to 3rd! Have Fun Stealing!

Get Austin Dingers in Batting Practice
If you want to unlock the Austin Dingers in batting practice then press L2+R2+L1+R1 simultaneously. It wont make any sound and will be right next to the Cooperstown Legends.

Bonus Teams
Enter exhibition mode, then repeatedly press L2+R2 until the sound of a dong is heard. The Dingers and Islanders will now be selectable under 90 teams.