Hardcore realism mode: Press Up, Down, Left, Right, White, Up, Down at the main menu. Alternately, get a 100 point rating on a track to unlock the hardcore realism mode option for that track. Shoot paintballs: Select single race or head-to-head mode. Press Up, Down, Left, Right, White, Up(2) at the "Race Day" screen. Use your horn (press Up) to shoot a paintball. Note: This also works in two player mode. Alternately, select practice mode and press Up, Down, Left, Right, White, Down(2) to enable paintballs. View credits: Press Up, Down, Left, Right, White, Left(2) at the main menu. High suspension: Press Up, Down, Left, Right, White, Left, Right at the main menu. Mini cars: Press Up, Down, Left, Right, White, Down, Up at the main menu. Wire frame cars: Press Up, Down, Left, Right, White, Right, Left at the main menu. Richard Petty: Successfully complete all Heat challenges with a bronze or higher rating.