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Meet Batman: Arkham World - The Batman Game That Doesn't Exist
The reason we call it The Arkham Trilogy is because it has three games in it. Batman: Arkham Asylum, Batman: Arkham City, and Batman: Arkham Knight. There's a fourth game sometimes thrown in there too - Batman: Arkham Origins. However, as this prequel is largely disconnected from the story and was made by a different developer, using the Arkham name purely as a way to piggyback off the prestige of the trilogy, most players don't count it. However, there is a second fourth game in the trilogy - Arkham World. The problem with this game is that it doesn't exist.