why are there ???? on each character

you can also add me to your friends list to play online with!  my ? is why are there ???? for each character for example i have all the pea shooters , agent, commando, toxic, ice, fire etc but there is still one with ??? on it how do i unlock this one? for all of the other characters as well. 

you can also add me to your friends list to play online with!

 

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Last updated July 3, 2018 Views 6 Applies to: