Literally unplayable. 95% of the time when I try to do a fight in "tactical challenge" it gives the message "Unable to connect to server." This happens both on WiFi and cellular network. It is NOT AN ISSUE WITH MY PHONE. I won't get into the fact that unless you P2W you can't compete, if you didn't start playing when it first launched, due to how they implement the PvP. I've seen similar issues reported with the "solution" being reinstallation. That's not a fix, that's typical Nexon laziness.