| 18 Wheeler: American Pro Trucker | Platform | PS2 |
| Nippon Maru |
| Hold X and press Start at the title screen. Keep X held until the mode selection screen appears. Choose any mode to drive the Nippon Maru truck. Alternately, successfully complete arcade mode with all four characters. |
| Bonus parking |
| Finish each of the four parking levels to unlock an additional parking level. Finish the bonus parking level to unlock a sixth parking level. |
| Unlock more parking levels |
| Finish the four parking levels to unlock a fifth parking level. If you finsih that as well, you will unlock a sixth parking level as well. |