The objective of the tower defense game known as Bloons Tower Defense is to prevent the annoying balloons from escaping your control before they pop. You may use darts, pins, or even bombs to take them out before you lose sight of them, but you must do so quickly. You have the opportunity to plan your strategy before each wave; therefore, you should make the most of both your time and your resources.
Click or tap on the towers you want to build, then click or tap on the spot where you want to put them. You can also click or tap on the towers you've made to see if there are any upgrades you can buy.