Secret Challenges
When you earn the 'Ultra' rank at the indicated level the corresponding Secret Challenge will become unlocked.
Secret Challenge #1:
Get Ultra Rank on Meteor Crater.
Secret Challenge #2:
Get Ultra Rank on Yellowstone.
Secret Challenge #3:
Get Ultra Rank on Mt. Rushmore.
Secret Challenge #4:
Get Ultra Rank on Riverboat.
Secret Challenge #5:
Get Ultra Rank on Null Void.
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