If you know how to play Dead Island 2 multiplayer then you can join with up to two friends or random players in multiplayer co-op to work together.
Dead Island - Deep Silver
How to unlock multiplayer co-op in Dead Island 2
Dead Island 2: How To Crossplay (Xbox One, Xbox Series X, S)
Buy DEAD ISLAND 2 GOLD EDITION
Dead Island 2 Gold Edition Download and Buy Today - Epic Games Store
Dead Island 2: 8 Tips For Co-Op Play
Dead Island 2 base Xbox One, PS4 players won't be able to host co-op sessions at launch
Co-Op Review: Dead Island – SideQuesting
Dead Island 2 Slayer guide: how to pick the best Slayer for you - Mirror Online
How to unlock co-op play in Dead Island 2
Dead Island - Deep Silver
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Is Dead Island 2 Cross Play? PS5, XBOX & PC
Dead Island 2