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. Aztec Valley track Beat a circuit on the easy difficulty setting. Alpine Challenge track Beat a circuit on the medium difficulty setting. Death Trap track Beat a circuit on the hard difficulty setting. 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.