However, the design continued evolving over the game's nine-year development period and game engine switch. In 1999, the game appeared to be abandoning the art styles of the original Team Fortress Classic by transitioning toward a more realistic and militaristic style of gameplay.

The game was first announced in 1998 as a sequel to the original Team Fortress mod for Quake (a first-person shooter video game, developed by id Software), but has since been through various concept and design periods. After several months of closed beta, Team Fortress 2 was finally released for Linux operating systems on February 14, 2013. The PC and OS X versions of Team Fortress 2 adopted a 'Free to Play' model on June 23, 2011, with all revenue being generated from microtransactions in the In-game Store. Following suit, it was released as a standalone title on April 9, 2008, and on June 10, 2010, Team Fortress 2 was released for Mac OS X. A PlayStation 3 version then followed on November 22, 2007. It was first released for Microsoft Windows and Xbox 360 on October 10, 2007. Team Fortress 2 is a team-based multiplayer first-person shooter developed by Valve Software as part of the game bundle The Orange Box. Minimum: OS X version Leopard 10.5.8, Snow Leopard 10.6.3, 1GB RAM, NVIDIA GeForce 8 or higher, ATI X1600 or higher, or Intel HD 3000 or higher, Mouse, Keyboard, Internet Connection.Recommended: Pentium 4 processor (3.0GHz, or better), 1GB RAM, DirectX® 9 level Graphics Card, Windows® 7 (32/64-bit)/Vista/XP, Mouse, Keyboard, Internet Connection.Minimum: 1.7 GHz Processor, 512MB RAM, DirectX® 8.1 level Graphics Card (Requires support for SSE), Windows® 7 (32/64-bit)/Vista/XP, Mouse, Keyboard, Internet Connection.Microsoft Windows, Xbox 360, PlayStation 3, Mac OS X, Linux Microsoft Windows (Retail - Standalone).Microsoft Windows & Xbox 360 (Retail - The Orange Box).This article may contain content that is out of date. You can help improve this article by updating the content as necessary.

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