Bonus Parking Levels
     Successfully  complete  each of the four parking levels to unlock
an  additional  parking level. Successfully complete the bonus parking
level to unlock a sixth parking level.

Cheat Mode
     At  the main menu, hold L and press A, Y, X, B, Left, Start. This
code unlocks all trucks, all tracks, and disables the timer.

Full Pause Screen
     Pause the game by pressing Start, then press A + X + B + Y.

Unlock Nihonmaru (Japanese Version)
     Successfully complete arcade mode with all four characters.