Countryballs: Tower Defense is a tactical defense game for mobile. The objective of the game is to build a defense against incoming hostile missiles and rockets. You can do so in a number of different ways. You can build a wall, use shields, or use a combination of the two. You can also use a variety of different towers and other structures to help with the defense.

The gameplay is divided into two main modes. The first is the classic mode, where you are able to use all of the towers and other structures that are available in the game. The second is the tactical mode, where you are able to select a team of 10 towers and other structures to help with the defense.

The game also includes a sandbox mode, where you can play around with different tower placements and other strategies.