Cheat mode:
Press B, Y, and X to change the icons in the first, second, and third boxes respectively at the match-up screen. The numbers in the following list indicate the number of times each button is pressed. After the icons have been changed, press the D-pad in the indicated direction to enable the code. For example, to enter 1-2-3 Left, press B, Y(2), X(3), Left.

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
Napalitano 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 No fatigue 3-4-3 Up
No contact mode 4-3-3 Left
Unlimited turbo 4-4-4 Down

Season FMV sequence:
Successfully complete a full season to unlock the Season FMV sequence at the Extras menu.

Challenge FMV sequence:
Successfully complete challenge mode to unlock the Challenge FMV sequence at the Extras menu.

Hint: Easy ability points:
To get easy ability points for a player in career mode, at the first game, go to "Option" and switch from the CPU to controller two. Only pitch fast balls right down the center and watch the points mount up. You can get only three points per game.