The game is decent, but unbalanced. To win npc campaign battle you have to take out buildings and all units. Now, to win arena you just have to take out buildings. At lvl 4 city hall you get 4 attack groups. All you have to do is attack all 4 sides of island and their troops go for yours. Than drop paratroopers onto the buildings and its done. 80-90% of your defense units still alive. Now, if you had to take everything out that'd be game and fair. Otherwise it's a money grab, buy buy buy.