The game is fun to play, but lots of settings are unfriendly to he north America time zone player. For example, some reward require you to achieve at 2 to 4 am if you live at Pacific time zone. It also have efficiency penalty for Taiwan night time, but it is day time in North America. Things like this make me feel been discriminated. One more bug. The notification system does not take into consideration that the server and phone might be in different time zone. So it calculates the notification base on server clock and send it at local time.