The first video game by Valve Corporation, an American developer and publisher, was Half-Life, a first-person shooter released in 1998. It received universal acclaim and sold over 9 million units in retail. Alongside Half-Life's launch, Valve released development tools to enable the player community to create content and mods. The company then proceeded to hire the creators of popular mods, such as Counter-Strike, which became the most popular multiplayer first-person shooter for the next decade. Valve continued their trend of developing predominantly first-person video games in the 2000s with a number of critically successful releases. By the end of 2008, combined retail sales of the Half-Life series, Counter-Strike series and The Orange Box had surpassed 32 million units. The company continued to release multiplayer games with the launches of Counter-Strike: Global Offensive and Dota 2, both of which have large eSports communities fostered by Valve. During the 2010s, Valve has focused on supporting their established multiplayer titles with regular content updates (Full list...)