This game is lesson 101 on how to ruin a decent game with ads,making them so irritable to the point of forcing players to shell out cash if they value their time in any way.The gameplay is decent, even tho enemies spawn in mid round with 5k health etc. Even that, sort of chocked up to the difficulty etc.But ads after each round ? Ads in the middle of progressing to the next stage ? Ads to double the reward u get ? If u do enjoy the gameplay like me, i would just suggest playing offline.