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When you have the indicated amount of Perfects the corresponding Rank or Gate will become unlocked.
Unlock Ensign Rank:
Get 1 Perfect
Unlock Co-Pilot Rank:
Get 3 Perfects
Unlock Pilot Rank:
Get 4 Perfects
Unlock Gate 1:
Get 5 Perfects and beat Level 9
Unlock ACE Rank:
Get 10 Perfects
Unlock Gate 2:
Get 10 Perfects and beat Level 11
Unlock Gate 3:
Get 15 Perfects and beat Level 28 or 29
Unlock Admiral Rank:
Get 25 Perfects