18 Wheeler - American Pro Trucker - Platform: Playstation 2
   
Unlock more parking levels:
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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. 

Unlock the Nippon Maru:
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At the title screen, hold X and press Start. Dont release X 
until the mode selection screen appears 
-or-
Beat the game with all four characters to unlock the Nippon Maru.