Tower Defense is a strategy game where the player's goal is to defend their territories and main base from enemy attacks. Build towers on empty spaces, and they will automatically attack enemies approaching them. Use various combinations of towers and elements to defend your base.
On a computer: use WASD or the arrow keys to move around the battlefield, or you can move the mouse pointer to the edge of the screen. Use the scrolling mouse to zoom in, or to move the camera away.
On a smartphone: use swipes to move around the battlefield. Swipes with two fingers to zoom in, or to move the camera away.