Counter-Strike popularized the multiplayer first-person shooter genre that remains popular today. In 1999, the now-famous mod titled Counter-Strike was released for free and became more popular than the underlying half-life game engine it relied on. Half-Life 2 became a popular platform for adding mods or modifications to the game. The sequel Half-Life 2 was released in 2004 adding impressive storylines and puzzle elements. Later in 1998 the game Half-Life offered improved graphic and true 3D. Doom featured pseudo-3D graphics and item drops in maze-like levels full of monsters.
The FPS genre was popularized in 1993 with the famous Doom game for personal computers running the MS-DOS command line operating system. As these games feature firearms and movement, the parent category is action games. First-person shooters (FPS) are a subgenre of shooting games and feature a point of view where the players see through the eyes of the game character.
