MLB Featuring Ken Griffey Jr.
New Teams

Highlight 'Exhibition' on the first baseball (menu) that pops up. Now simultaneously press all four C buttons. Do this many times and you will hear a beep. Then go to the All-Star teams and there will be two new teams: Nintendo and Angel Studios.

Move Logo

At the title screen hold Z to make the baseball in the logo stop spinning. Keep holding Z and then move the joystick to make the baseball rotate however you like. It's a useless trick, but a fun one.

See Ending (Win World Series)

Go to an Exhibition game and pick your teams. When picking the stadium you want to play in, press all four C-Buttons many times. You will hear a chime if you've done it correctly. Then press the Z-Button to view the stadium. Instead of showing the stadium, you will get to see the ending of the game, just as if you have just won the world series.

Shoot Fireworks

When you get into the "View Stadium" mode by pressing the Z button while choosing your stadium, you can shoot fireworks at the same time. The fireworks should shoot near home plate. This code works in every stadium.

Unhittable Pitch

Place the crosshair anywhere in the strike zone except the yellow hitting circle. Holding the cross hair where you want it, press Z and then C-Up, Left, or Right to look at one of the bases. Release the Z button first, then release the Cbutton. You should be brought back to the batter and no cross hair or hitting circle should be there. Throw whatever pitch you want and the computer will either swing and miss or watch it go by for a strike.

Check out CPU pitcher

If you are playing alone, press R on controller 2 to see the opposing team pitcher's status.

Change Uniforms
When you're the visiting team and you hit a homerun, wait for the camera to show your teamates cheering for you in the dugout and press A. You're players will switch to the opposing team's colors.