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VARIOUS HINTS
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¯ Normal Bonus Levels:
  Don't lose any lives in challenge mode to unlock extra levels. You get them
  for every world that you finish without using any continues.

¯ Master Bonus Levels:
  Complete all 10 master mode levels without using any continues.

¯ Master difficulty setting:
  Select the expert difficulty setting and complete all 50 levels in Worlds 5
  through 10 and the 10 bonus expert levels without using any continues.

¯ Party games:
  It takes 2500 play points to unlock a party game.
  Hint: Play the Beginner Level in challenge mode a few times without continuing
        to get easy play points.

¯ Gift option:
  After you have unlocked all party games, the gift option will be unlocked at
  the "options" screen. You can buy more lives in challenge mode, in-game movies
  and the staff credits by using play points.