Low rider trucks
 
 Enter "YRDR" as a password.
 
 Gut bomb
 
 Enter "BRPS" as a password.
 
 Full-time missiles
 
 Enter "Y_WNT_T" as a password to have unlimited missiles. Note: "_"
 indicates a space. Then while playing a game, press Left to use the
 missiles. 
 
 Turbo mode
 
 Enter "CFFNYN" as a password.
 
 Alternate textures
 
 Enter "JMPNG" as a password to change all textures in the game into
 pictures of one of the programmers of the game.
 
 Change track color
 
 Enter "JMPR" as a password. Select "Done" and "JIM" will appear in
 the square. Press Start, select "New Game", then choose "Summit
 Rumble". Select any number of players, but many CPU trucks. When the
 game begins, there should be black squares with aliens or other
 objects in the middle. -From: ALXMA7@aol.com 
 
 Aztec Valley track
 
 Successfully complete a circuit on the easy difficulty setting.
 
 Alpine Challenge track
 
 Successfully complete a circuit on the medium difficulty setting.
 
 Death Trap track
 
 Successfully complete a circuit on the hard difficulty setting.
 
 All tracks
 
 To access all tracks in time trial or custom race, unlock the Death
 Trap track, then press B at truck selection screen. Start your own
 race or time trial on the expert difficulty setting and all tracks
 will be available. 
 
 Horn
 
 While driving, press Down to use the horn. Note: There are many
 different type of horns that are randomly assigned at the beginning
 of a race. 
 
 Sound effects
 
 While driving, press Up to hear "Yahoos", burps, and farts.
 
 Hints
 
 Entering the Ancient Temple
 
 Go to the Ancient Temple located at the southwestern part of the
 Ruins Track. There are four entrances but only one can be used to
 enter. The real entrance is on the side farthest away from the track.
 Once in the entrance, turn left and accelerate to enter the temple.
 
 Crushed truck
 
 Get the shrinker power-up. Then, shrink your opponents and crash into
 them. When they become large again they will be crushed. Note: The
 trucks will only be crushed for a short period of time. They will
 slowly regain their original size.
 
 Big tires when hovering
 
 Note: Two players are required to perform this trick. Have player one
 get the hover power-up and player two get the shrinker power-up.
 Then, have player one use the hover and begin to fly. While player
 one is in the air, have player two use the shrinker. The truck will
 shrink but the tires will remain the same size. 
 
 Level passwords
 
   
  Level            
  Password                                             
   
  Beginner         
   
  Ruins            
  G[Up Arrow][Star]NJ2L0                               
   
  Junk Yard        
  J[Star]XQYN4G                                        
   
  The Heights      
  M[Star]OT1Q9R[Left Arrow]                            
   
  Voodoo Island    
  P[Left Arrow]3W4TC[Star][Left Arrow]F[Up Arrow]      
   
  Greenhill Pass   
  5[Up Arrow]627WFX9[Left Arrow]23G                    
   
  Wasteland        
  V[Left Arrow]92[Up Arrow]2[Down Arrow]0CL56B5V       
   
  Aztec Valley     
  YYC5D2L3F[Right Arrow]89[Down Arrow]8[Right Arrow]B7 
   
  Intermediate     
   
  Ruins            
  GBGJ5MTL                                             
   
  Junk Yard        
  JNJMQL7S                                             
   
  The Heights      
  MJMPT[Right Arrow]XRN                                
   
  Voodoo Island    
  PJPSWR0[Star]89R                                     
   
  Greenhill Pass   
  SBSV2[Star]3XBC[Up Arrow]4[Down Arrow]               
   
  Wasteland        
  VBVY2X60[Down Arrow]FD7B2M                           
   
  Aztec Valley     
  YFY15093H[Left Arrow]G[Up Arrow][Down Arrow]5675     
   
  Alpine Challenge 
  1N1483C6KLJDH89[Up Arrow]G4N                         
   
  Expert           
   
  Ruins            
  GKGH[Up Arrow]G[Star][Left Arrow]                    
   
  Junk Yard        
  JGJKLJP[Star]                                        
   
  The Heights      
  MSMN[Right Arrow]M7QW                                
   
  Voodoo Island    
  PKPQRP[Up Arrow]T793                                 
   
  Greenhill Pass   
  SKST[Star]SDW[Up Arrow]C61R                          
   
  Wasteland        
  VOVWXVGZDF9463R                                      
   
  Aztec Valley     
  YGY209YJ2G[Left Arrow]C796462                        
   
  Alpine Challenge 
  101231M5JLF[Up Arrow]C979S0D                         
   
  Death Trap       
  404564P8M[Right Arrow][Left Arrow]DFC[Up Arrow]CV32KC
   
  Game Shark Codez:
 
       
  Unlock Aztec Valley Track                         
  801256BF 0001
       
  Unlock Alphine Challenge Track                    
  801256DF 0001
       
  Unlock Death Trap Track                           
  801256FF 0001
       
  Infinite Missiles on Pick-Up                      
  D0164BBF 0001
  801A6054 0009
       
  Press L For Low Timer                             
  D0014B35 0020
  811A671C 3E00
       
  Press L For Weapon Modifier                       
  D0014B35 0020
  811A6058 0000
  D0014B35 0020
  811A605A 00??
       
  No Laps to Race (GS 3.0 or Higher Needed)         
  D11A5F2E 00FF
  801A5F2F 0002
       
  Quantity Digits to Accompany Weapon Modifier Code 
       
  00 - Nitro                                        
  01 - Hover Weapon                                 
  02 - Lightning                                    
  03 - 'Blimp' Missile                              
  04 - Spring                                       
  05 - Diamond                                      
  06 - Homing Missiles                              
  07 - Oil Slick