Honestly it's a good game to kill spare time, the only problem is to catch up everything you need to be constantly be playing this game or else the process won't go anywhere, especially the leader board for the special events. What I learn about this game is that to earn all those energy is either watch ads or buy energy with real cash. Or else you will have to wait 2 min for 1 energy which means to have a full bar you'll have to wait another hour & an half for only 75 energy that barely do good