Unlocking Levels 6 and 12
To unlock levels 6 (Atlantis, 2015) and Level 12 (1502, Italy),
complete these requirements:
Level 12 - Italy, 1502: Get a rank of "Air Virtuoso"
or higher on Level 11
Level 6 - Atlantis, 2015: Get 100% in a repair on The Twin
Fighter (or any electronic-based repair mini-game) after Level 5.
Unlockables
Star Glider: Successfully Complete the Game