MLB SlugFest 2003 - Platform: Gamecube

Cheat mode
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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. 

Effect Code 
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Log bat 0-0-4 Up 
Wiffle bat 0-0-4 Right  
Mace bat 0-0-4 Left  
Rubber ball 2-4-2 Up  
Softball 2-4-2 Down  
Maximum speed 0-0-3 Left  
Maximum power 0-3-0 Left  
Maximum batting  3-0-0 Left  
Big heads 2-0-0 Right  
Small heads 2-0-0 Left  
Unlimited turbo 4-4-4 Down  
Extra time after plays 1-2-3 Up  
Tournament mode 1-1-1 Down  
No fatigue 3-4-3 Up  
No contact mode 4-3-3 Left  
Rocket Park stadium 3-2-1 Up  
Roman Coliseum stadium 3-3-3 Up  
Monument stadium 3-3-3 Down  
Pinto Team  2-1-0 Right  
Horse Team 2-1-1 Right  
Lion Team 2-2-0 Right  
Eagle team 2-1-2 Right  
Todd McFarlane team 2-2-2 Right  
Terry Fitzgerald team 3-3-3 Right  

More homeruns
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Enable the "Rubber ball" code for a better chance of hitting homeruns. 
Enable the "Maximum batting", "Maximum speed", and "Maximum power" 
codes to get either a big hit or homerun about 70% of the time. 

Less homeruns
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Enable the "Softball" code for less of a chance of hitting homeruns. 

Easy ground balls and fly balls
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Throw a fastball low for a ground out or a fastball high for a fly out. 
This works about 90% of the time.