Was a very fun game, with the choice of pvp or teaming up and play co-op, plus the random events. Last update took away co-op and replaced it with a semi co-op. You get a couple of keys a day and use those for co-op. Yes I know a dev responded elsewhere that you can still play co-op without keys. That's limited to clanmates and friends, plus you get a severe reduction in rewards. Uninstalled and will not play again until full co-op is restored.