Tower defense games are an addictive style of online gaming. It combines the thrill of strategy and action, as players must defend their base or goal using towers or other defensive mechanisms. Originally a sub-genre of real-time strategy and war games, Tower defense has evolved over the years, becoming one of the most popular types of gaming in the flash, unity and web-based gaming market. Players must use their wits and quick reflexes to create a defense against waves of enemies in the form of creeps, aircrafts and tanks.