Devil May Cry 3 HD

Leviathan has three hearts: red on the left, blue on the right, green in the middle (sort of like green). If you hit the red one, the blue one will be taken away by Devil Trigger. If you hit the blue one, the red one will take away the red orbs that fall from the enemies attacking you. When you beat one of the two hearts, the middle one will open, run up and beat it.