xtank circa '89-92? it's a 2D overhead tank-combat strategy game white on black. One of the first multiplayer games out there. Played on the University's UNIX server. You built your tank from chassis to turret, even needed heat sinks or your engine would overheat. Chassis ran from Motorcycle to Tracked Juggernaut.
DOOM, the Original circa '93
Day of Defeat circa '01 from the Download to the Disc Release to the Steam Release until eGO stopped supporting...
Call of Duty whatever the latest release is.
FPS FTW!