Unlockables - 

All Players - At the title screen or during the game, press Left, Up, Left, Right, Down, Right, Left, Up.

All Stadiums - At the title screen or during the game, press Down, Up, Left, Right, Up, Right, Up, Down.

All Teams - At the title screen or during the game, press Left, Right, Right, Down, Down, Left, Up, Up.

All Uniforms - At the title screen or during the game, press Up, Down, Right, Left, Down, Right, Down, Up.

Super Pitch Break - At the title screen or during the game, press Right, Left, Right, Left, Right, Left, Up, Up.

Super Pitch Speed - At the title screen or during the game, press Up, Up, Up, Left, Left, Left, Left, Right.

Super Six Pitches - At the title screen or during the game, press Down, Up, Down, Right, Right, Right, Right, Left.

Big Ball - At the title screen or during the game, press Up, Up, Right, Left, Up, Up, Right, Left.

Big Head - At the title screen or during the game, press Left, Right, Left, Right, Up, Down, Up, Down.

Small Head - At the title screen or during the game, press Up, Down, Up, Up, Right, Right, Right, Left.

Fast Run - At the title screen or during the game, press Left, Right, Left, Right, Left, Right, Up, Up.

Slow Run - At the title screen or during the game, press Right, Left, Right, Left, Right, Left, Down, Down.

Black and White - At the title screen or during the game, press Up, Up, Down, Down, Left, Right, Left, Right.

Beans - At the title screen or during the game, press Right, Right, Right, Right, Right, Right, Left, Down.