How to play Dead Island 2 multiplayer with online co-op

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 2: How to Play Co-Op Is There Couch Co-Op? - Gameranx

Dead Island - Deep Silver

Dead Island 2 Players Can't Host Co-Op Games If They're On A Base

Steam Community :: Guide :: How To Play Local, Split-Screen

Dead Island 2 players on PS4 and Xbox One can't host co-op

Does Dead Island 2 have crossplay and co-op? - Meristation

Dead Island 2 multiplayer co-op: How to play with friends