

While later arcade games like Defender (1981) and Choplifter (1982) lacked the strategy element of Missile Command, they began a trend of games that shifted the primary objective to defending non-player items. For these reasons, some regard it as the first true game in the genre. Additionally, in Missile Command, the sole target of the attackers is the base, not a specific player character. The innovation was ahead of its time and anticipated the genre's later boom, which was paved by the wide adoption of the computer mouse. Missile Command was also the first of its kind to make use of a pointing device, a trackball, enabling players to use a crosshair. In the game, players could obstruct incoming missiles, and there were multiple attack paths in each attack wave.

The 1980 game Missile Command changed that by giving shields a more strategic role. The game featured shields which could be used to strategically obstruct enemy attacks on the player and assist the player in defending their territory, though not to expressly protect the territory. The object of the arcade game Space Invaders, released in 1978, was to defend the player's territory (represented by the bottom of the screen) against waves of incoming enemies. The tower defense genre can trace its lineage back to the golden age of arcade video games in the 1980s.
