How to play co-op in Dead Island 2

While you might be dying to kill some undead with your friends right away, you will need to play solo for a while before the option opens up to you.

 Start up Dead Island 2and begin the campaign 

Step 1: 

Complete the opening missions up to and including "Bel-Air Brawl." 

Step 2: 

Once you have finished that mission, you will receive a tutorial explaining that co-op has been unlocked.

Step 3: 

You can participate in a co-op session in a few ways. 

How co-op work

The first is to join a session that's in progress through the main menu. 

To do this, simply hit Join and you can either find a random person online to play 

with via the Quick Join option or choose a friend via an open lobby from the list.