Bloons tower defense 6, also known as BTD 6, is a tower defense game where balloons/bloons go along a path and try to get to the end. When they do, you lose a life point. If you lose too many, then you lose. There are different types of bloons, with certain powers, and more health. The more health a bloon has, the more damage it does to you. Monkeys defend you by popping the bloons. The monkeys can be upgraded to do more damage, shoot faster, have a bigger radius, do different attacks, and gain power ups.