Hidden Players
Below is a list of their name and PIN #:

ALEC - 1197 
ALIEN - 1111 
AOB - 1111 
AUBREY - 7777 
AZPOD - 4777
BOXER - 2111
BRAIN - 1111
CALEB - 0996 
CARLTN - 1111 
CURTIS - 1111
DANIEL - 0604
DAVID - 3333
DINO - 1111
EDDIE - 3333
FORDEN - 1111
FRANZ - 1010 
GENTIL - 1111 
GRINCH - 0222
GUIDO - 2222
GUMBY - 8698
JAPPLE - 6660
JASON - 3141 
JEFF - 1111 
JENIFR - 3333 
JOVE - 6644 
LEX - 7777 
LUIS - 3333 
MOOSE - 1111
MXV - 1014 
NATHAN - 0515
PIRATE - 1111
PUNKR - 1221
PUNKB - 2112
RAIDEN - 3691
RALPH - 1111
RANDU - 6666
ROOT - 6000
SAL - 0201
SHINOK - 8337
SHRUNK - 6666
SAD - 1111
SKULL - 1111
SMILE - 1111
THUG - 1111
TREX - 1111
TURMEL - 0322 
WHODAT - 1844  
 
 Hide play cursor
 
 At the play selection screen, press Up(2) on the top left corner of
 the screen. 
 
 Cheat Codez:
 
 At the versus screen, press Turbo, Jump, and Pass to change the icons
 below the helmets. 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 or Analog-stick in the indicated direction
 to enable the code. If you entered the code correctly, you will see
 the name of the code and hear a sound. For example, to enter 1-2-3
 Left, press Turbo, Jump(2), Pass(3), Left. Note: More then one code
 may be activated per game. 
 
                
 Result                       
 Code       
                
 Infinite turbo               
 5-1-4 Up   
                
 Fast turbo running           
 0-3-2 Left 
                
 Power-up offense             
 3-1-2 Up   
                
 Power-up defense             
 4-2-1 Up   
                
 Power-up teammates           
 2-3-3 Up   
                
 Power-up blockers            
 3-1-2 Left 
                
 Super blitzing               
 0-4-5 Up   
                
 Super field goals            
 1-2-3 Left 
                
 No interceptions             
 3-4-4 Up   
                
 No random fumbles            
 4-2-3 Down 
                
 No first downs               
 2-1-0 Up   
                
 No punting                   
 1-5-1 Up   
                
 Allow stepping out of bounds 
 2-1-1 Left 
                
 Fast passes                  
 2-5-0 Left 
                
 Turn off stadium             
 5-0-0 Left 
                
 Lights out                   
 5-3-4 Down 
                
 Late hits                    
 0-1-0 Up   
                
 Show field goal %            
 0-0-1 Down 
                
 Show punt hang meter         
 0-0-1 Right
                
 Use team plays               
 1-0-0 Up   
                
 Hide receiver name           
 1-0-2 Right
                
 Invisible receiver highlight 
 3-3-3 Left 
                
 Invisible                    
 4-3-3 Up   
                
 Big football                 
 0-5-0 Right
                
 Big head                     
 2-0-0 Right
                
 Huge head                    
 0-4-0 Up   
                
 No head                      
 3-2-1 Left 
                
 Headless team                
 1-2-3 Right
                
 Team tiny players            
 3-1-0 Right
                
 Team big heads               
 2-0-3 Right
                
 No play selection [Note 1]   
 1-1-5 Left 
                
 Show more field [Note 1]     
 0-2-1 Right
                
 No CPU assistance [Note 1]   
 0-1-2 Down 
                
 Power-up speed [Note 1]      
 4-0-4 Left 
                
 Hyper blitz [Note 1]         
 5-5-5 Up   
                
 Smart CPU opponent [Note 2]  
 3-1-4 Down 
                
 Tournament mode [Note 3]     
 1-1-1 Down 
                
 Always quarterback [Note 4]  
 2-2-2 Left 
                
 Always receiver [Note 4]     
 2-2-2 Right
                
 Old day stadium              
 5-0-1 Up   
                
 Day stadium                  
 5-0-1 Down 
                
 City stadium                 
 5-0-1 Left 
                
 Old night stadium            
 5-0-2 Up   
                
 Night stadium                
 5-0-2 Down 
                
 Future stadium               
 5-0-2 Left 
                
 Old snow stadium             
 5-0-3 Up   
                
 Snow stadium                 
 5-0-3 Down 
                
 Roman stadium                
 5-0-3 Left 
                
 Grass field                  
 3-0-0 Up   
                
 Asphalt field                
 3-0-1 Up   
                
 Dirt field                   
 3-0-2 Up   
                
 Astroturf field              
 3-0-3 Up   
                
 Snow field                   
 3-0-4 Up   
                
 Fog on                       
 0-3-0 Down 
                
 Thick fog on                 
 0-4-1 Down 
                
 Weather: clear               
 2-1-2 Left 
                
 Weather: snow                
 5-2-5 Down 
                
 Weather: rain                
 5-5-5 Right
                
 Night game                   
 0-2-2 Right
                
 Note 1: Two player agreement required.
 
 Note 2: Only in one player game.
 
 Note 3: Only in two player game.
 
 Note 4: Two human teammates required.
 
 Game Shark Codez:
 
 Note: You must have a 3.0 or higher version of the Game Shark to use
 these codes.
 
               
 Enable Code (Must Be On)    
 F10261D2 0120
               
 Infinite Turbo P1           
 810EC12C 42C8
 810EC12E 0000
               
 No Turbo P1                 
 810EC12C 0000
 810EC12E 0000
               
 Infinite Turbo P2           
 810EC164 42C8
 810EC166 0000
               
 No Turbo P2                 
 810EC164 0000
 810EC166 0000
               
 Infinite Turbo P3           
 810EC19C 42C8
 810EC19E 0000
               
 No Turbo P3                 
 810EC19C 0000
 810EC19E 0000
               
 Infinite Turbo P4           
 810EC1D4 42C8
 810EC1D6 0000
               
 No Turbo P4                 
 810EC1D4 0000
 810EC1D6 0000
               
 Always 1st Down             
 810EC01E 0001
               
 Always 4th Down             
 810EC01E 0004
               
 Team 1 Always on Fire       
 800EC0CB 0001
               
 Team 1 Never on Fire        
 800EC0CB 0000
               
 Team 1 Always Has the Ball  
 800EBFFF 0000
 800EC007 0000
               
 Team 2 Always on Fire       
 800EC0CF 0001
               
 Team 2 Never on Fire        
 800EC0CF 0000
               
 Team 2 Always Has the Ball  
 800EBFFF 0001
 800EC007 0001
               
 Team 1 Score Modifier Codez: 
               
 1st Quarter                 
 800EBFBF 00??
               
 2nd Quarter                 
 800EBFC3 00??
               
 3rd Quarter                 
 800EBFC7 00??
               
 4th Quarter                 
 800EBFCB 00??
               
 Team 2 Score Modifier Codez: 
               
 1st Quarter                 
 800EBFDB 00??
               
 2nd Quarter                 
 800EBFDF 00??
               
 3rd Quarter                 
 800EBFE3 00??
               
 4th Quarter                 
 800EBFE7 00??