Complex - You’ve done it. You beat all the soldiers, zombies and aliens that challenged you in the latest video games in your stash. Now, one more challenge awaits, and that's the boss battle. To gamers, defeating a level's boss symbolizes the completion of hours of emotion, ranging from excitement and elation to hopelessness and anger. Anyone who's finished Contra knows the feeling of finally conquering the Red Falcon after levels of depressing fails. Watching Donkey Kong fall on his head and reuniting Mario with his cherished Pauline was cheesy no doubt, but the feeling of doing it was exhilarating.