Bloons Tower Defense 4 is a popular tower defense game that was originally created as a Flash game. You will need to strategically build towers around the map in order to protect your base from falling. Enemy balloons are flying towards your base and you will need to use your defense towers to shoot them down before they reach your base. You only have 200 lives, which decrease whenever a balloon makes it to the end of the path. Earn money after popping each balloon which you can use to purchase upgrades or build more towers.