Im been playing around in days , this game i only go to PVP to challenge others but then i try in Co-Op.. man even the slightiest mistake and the boss is so difficult to beat that has a high amount of lifespan that needs more damage to beat with it and the most lastly is that all of my heroes are not strong enough , even my heroes are at level 5 to 7 and it need some "MANA" , i think you should do something about it .. love the game but it so diffucult , need some update or i delete this game..