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GameBoy Advance Cheats: MLB Slugfest 20-04 Cheats

Cheat Mode
Press B, A, and R to enter the following codes on the match-up screen. The numbers in the following list indicate the number of times each button is pressed. After the first part of the code has been entered, press the D-pad in the indicated direction to enable it. Example, to enter 1-2-3 Right, press B, A(2), R(3), Right. A message will appear to confirm correct code entry.

Effect Code

All fielders run 1-3-2 Up
Fireworks 1-4-1 Right
1920 mode 2-4-2 Up
Ghost fielders 3-1-3 Down
Skull ball 3-2-3 Left
Nuke ball 3-4-3 Up
Backwards fielders 4-4-4 Right