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VARIOUS HINTS
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¯ Bonus levels:
  After the villagers build all 16 monuments an intermission sequence will begin
  and a new level will start. Fulfill the villagers wishes and the credits will
  start after they build their monument. Several bonus levels will now be
  unlocked at the main menu.
  Build the good and bad variations of the 15 monuments in the museum. Then,
  destroy one of the monuments. The villagers will build a mystery monument,
  followed by an intermission sequence and bonus levels.

submitted by Texmex