Plot: Spacewar! is a space combat video game developed in 1962 by Steve Russell in collaboration with Martin Graetz, Wayne Wiitanen, Bob Saunders, Steve Piner, and others. It was written for the newly installed DEC PDP-1 minicomputer at the Massachusetts Institute of Technology. Wikipedia
Plot: Alien Shooter is an isometric, top-down shooter video game developed and released by Sigma Team, a Russian games development studio. Released on May 18, 2003, it was initially available on Microsoft Windows, iOS, and Android. Wikipedia