Play Bloons Tower Defense 4 to present your defensive skill! This action game is back with more levels and challenges to conquer. You need to buy some towers then place them along the track to shoot down all bloons that are passing through. Your goal is to stop all of them from getting to the end of the path. To achieve it, make sure you place the towers carefully. Earn more money from killing and use it to buy even more towers! Have fun!