All players' scores are often displayed onscreen so players can see their relative standing. In such games, play is alternated at some point (often after the loss of a life). Other early video games included turn-based multiplayer modes, popular in tabletop arcade machines. Multi-user games developed on this system included 1973's Empire and 1974's Spasim the latter was an early first-person shooter.
The first examples of multiplayer real-time games were developed on the PLATO system about 1973. Some of the earliest video games were two-player games, including early sports games (such as 1958's Tennis For Two and 1972's Pong), early shooter games such as Spacewar! (1962) and early racing video games such as Astro Race (1973).
