Defence of Towers

The basic gameplay elements of tower defense are

territories, possessions, domiciles, loved ones (or collectively the "base") that must be defended by the player or players waves of multiple incoming "enemies" that must be defended against placement of "tower" elements, such as towers, or obstructions along the path of attacking enemies What distinguishes tower defense base defending games from other base defending games (such as Space Invaders, or other games where bases are defended) is the player's ability to strategically place, construct or summon obstructive constructions and constructive obstructions in the path of attacking enemies.

In a tower defense, unlike the base, the player's main character is often invincible, as the primary object is the survival of the base rather than the player.