GTA: Bloons Tower Defense 4
Once again, the monkeys stand in the way of conquest of the evil balloons. This time, the monkeys are even more powerful as they come with some great reinforcement against the dreaded balloons. The balloons will keep on going to the other end and it is your job to make sure that none of them reaches the end. You would need to assign some dedicated towers to protect the site. Each balloon that you pop earns you money. You can use the money to purchase new tower and for upgrading the existing ones too. As you make some progress in the game, you would need to place more defense since there would be more powerful balloons that you would need to pop.