18 Wheeler: American Pro Trucker Cheats (Dreamcast)

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

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.

Successfully complete arcade mode with all four characters.

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.