Description
This is a concept art of FPS multiplayer game that (I guess) will never be created
Also I can explain the main roles of these classes.
Assault-a guy that gives ammunition and giving hell for enemies(that their main purpose)
Engineer-this guy can place sentry guns and other buildings also this bro can give you armor
Doctor-this guy can heal ,revive and cure,curing the infections and giving other teammates gas masks
Recon-their main purpose is spotting the enemies,destroying buildings and heavy targets
Mastermind-their main purpose is inspiring the team(giving damage boost,health,stamina,speed regeneration) to teammates
Also every class has their own sub-classes,but I guess that's enough stuff that I told about this because the description is too long.