Meet the requirement of the stage to unlock the boss.
Boss | How to unlock
|
---|
Gnezdo | Steel Beast - 25 Coup de grace attacks before 80 kills.
|
Gnezdo | High Sea Fortress - 40 melee kills before 80 kills.
|
Napad | Urban Chaos - 15 Counter Kills before 80 kills.
|
Strelat | Mining the Depths - Kill 70 enemies before 600 seconds.
|
Strelat | Catacombs - 20 Quick Shot Kills.
|
Ubistvo | Rail Yard - 25 Quick shot kills before 80 kills.
|