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VARIOUS HINTS
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¯ Secret character:
  Successfully complete the arcade mode with all four characters to get
  "Nippon Maru".

¯ More bonus parking levels:
  First new level:   Successfully complete each of the four parking levels.
  Second new level:  Successfully complete the new bonus parking level.

¯ Two bonus trailers in score attack mode:
  Successfully complete the arcade mode with all four characters.

¯ Lizard Tail:
  Successfully complete the game with all four trucks and the bonus truck
  Nippon Maru.