Build towers to stop waves of enemies.
Survive all 25 waves!
Tower defense emerged as a genre from StarCraft custom maps in the late 1990s, where players placed defensive structures along fixed paths to stop waves of enemy units. Desktop TD and Flash-era classics like Bloons TD popularized the format and proved that strategic placement games could be endlessly replayable. The genre rewards careful thinking over fast reflexes: tower placement, upgrade timing, and resource management are what determine success or failure. Each wave introduces tougher enemies that demand new strategies, and boss waves force players to concentrate their firepower. The satisfaction of watching a perfectly designed defense shred an incoming wave without losing a single life is what keeps players coming back.