Box as a bear
 
 At the main menu, press Right + Square, Right + Triangle, Right +
 Circle, Right + X. If you entered the code correctly, you will hear a
 sound. Then select any boxer to play as a bear.
 
 Big head mode
 
 At the main menu, press Left + Circle, Left + Triangle, Left +
 Square, Left + X. If you entered the code correctly, you will hear a
 sound. 
 
 Super boxer
 
 Select career mode, create a boxer, and enter "PSIRULES" as the name.
 Save the created boxer and exit career mode. Then, enter career mode
 again and load the boxer, which will now have full attributes and
 other special features. -From: hurt3@execpc.com
 
 Regain energy
 
 When given a choice to hit the heavy or speed bag between fights,
 hold L1 + L2 + R1 + R2 to regain two to eight points of energy,
 depending on how long the buttons are held.
 
 Taunt opponent
 
 During a match, press R1 + R2 + X.
 
  Game Shark Codez:
 
       
  P1 Infinite Stamina                              
  801DA5DE 002D
  801DA606 002D
       
  P1 No Stamina                                    
  801DA5DE 0000
  801DA606 0000
       
  P1 Max Power                                     
  801DA60C 0BB2
       
  P1 No Power                                      
  801DA60C 0000
       
  P2 Infinite Stamina                              
  801DAF6A 002D
  801DAF92 002D
       
  P2 No Stamina                                    
  801DAF6A 0000
  801DAF92 0000
       
  P2 Max Power                                     
  801DAF98 0BB2
       
  P2 No Power                                      
  801DAF98 0000
       
  Arena Modifer                                    
  800AF790 000?
       
  Create A Boxer                                   
       
  Max Power                                        
  800C12AC 0064
  800B0A7C 0064
       
  Max Speed                                        
  800C12B0 0064
  800B0350 0064
       
  Max Stamina                                      
  800C12B4 0064
  800B09E0 0064
       
  Quantity Digits to Accompany Arena Modifier Code 
       
  00 - Madison Square Garden                       
  01 - Top Rank Arena                              
  02 - Ring Magazine Arena                         
  03 - Great Western Forum                         
  04 - Grand Casinos                               
  05 - Caesar's Palace                             
  06 - Schtanzes Cajun Corner                      
  07 - Generic