Arkham City (NG+) - Part 4: Diminishing Hope

Following Mr. Freeze's advice, we go down to the underground lair of Ra's al Ghul to obtain a sample of his blood so we can create a cure for Batman and Joker's illness. In the process, we have the two coolest boss fights in the whole game (Freeze and Ra's), and we also fully complete the side missions including Hush, Azrael, Bane, and the Mad Hatter.