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Left 4 Dead 2 is a 2009 first-person shooter video game developed and published by Valve. The sequel to Left 4 Dead (2008) and the second game in the Left 4 Dead series, it was released for Microsoft Windows and Xbox 360 in November 2009, Mac OS X in October 2010, and Linux in July 2013.
Steam is a digital distribution service and storefront developed by Valve Corporation.It was launched as a software client in September 2003 to provide game updates automatically for Valve's games and expanded to distributing third-party titles in late 2005.
Source SDK was launched as a free standalone toolset through Steam, and required a Source game to be purchased on the same account. Since the release of Left 4 Dead in late 2008, Valve began releasing "Authoring Tools" for individual games, which constitute the same programs adapted for each game's engine build.
In January 2014, GameSpot compared the performance of three games (Dota 2, Left 4 Dead 2, and Metro: Last Light) running on Windows 7 x64 and SteamOS 1.0 beta. With an AMD graphics card, they found that all ran at considerably fewer frames per second on SteamOS, and Left 4 Dead 2 stuttered, which they attributed to a device driver problem.
A sequel, Left 4 Dead 2, was announced at the 2009 E3 conference and was released on November 17, 2009. [135] Addressing concerns voiced by fans, Gabe Newell responded to an email from Kotaku explaining that despite the upcoming sequel, Left 4 Dead would continue to be supported and more content was planned in the coming months. [136]
On June 27, 2012, SFM became available on a limited basis through Steam, the same day the final Meet the Team video "Meet the Pyro" was released. [20] The open beta for Windows was released as of July 11, 2012. [21] [22] From 2011 to 2018, Valve operated a competition known as the Saxxy Awards for community-made SFM animations.
The 2024–25 season is the 126th season in the existence of AC Milan, and the club's 91st season in the top flight of Italian football.In addition to the domestic league, Milan is also participating in the Coppa Italia, Supercoppa Italiana and UEFA Champions League.
Directed graph showing the orbits of small numbers under the Collatz map, skipping even numbers. The Collatz conjecture states that all paths eventually lead to 1. The Collatz conjecture [a] is one of the most famous unsolved problems in mathematics.