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VARIOUS HINTS
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¯ Diamond Cup:
  Finish the the Ruby, Sapphire and Emerald Cups in first place under the
  standard or expert difficulty setting.

¯ Master Class:
  Finish the the Ruby, Sapphire and Emerald Cups in first place under the
  expert difficulty setting.

¯ Dark Schneider vehicle:
  Successfully complete the game in "Story Mode" to unlock Dark Schneider
  with his Deathborn vehicle.