Gotham Knights Could Have 4-Player Co-Op According To PSN Listing - Game Informer

The description for the game still mentions co-op with up to one other player, though.

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Gotham Knights is a brand-new open world, third-person action RPG featuring the Batman Family as players step into the roles of Batgirl, Nightwing,

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Gotham Knights, 4 Players Co-op

Gotham Knights Will Apparently Support 4 Player Co-Op