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Unlock Bonus Level
Finish the game once.
Unlock Inferno
Defeat Sector 2 Base boss - Colossus.
Unlock Judgement
Defeat Sector 2 City boss - Enforcer.
Unlock Neutron Gun
Defeat the boss on Infinity mode level 30.
Unlock Onslaught
Defeat the boss on Infinity mode level 10.
Unlock Trident
Defeat the boss on Infinity mode level 60.
Unlock Vulcan
Defeat the boss on Infinity mode level 20.
Unlockable: Blast Helm
Defeat Enforcer, the lvl 50 boss.
Unlockable: Surge Helm
Defeat Mantis, the level 40 boss.
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