Invasion 2000 A.D. is a single-player shoot'em up game in which players control a spacecraft at the bottom of the screen, moving left or right to shoot descending waves of aliens. In this game, set in a futuristic sci-fi universe, players defend Earth from an alien invasion by eliminating waves of enemies before they reach the bottom of the screen. It stands out with its classic arcade-style gameplay, featuring fast-paced action and strategic movement, along with the challenge of managing multiple enemy formations and increasing difficulty levels.