Counter-Strike: Source was announced to the public on May 12, 2004, at the
E3 presentation as the multiplayer counterpart to
Half-Life 2 on the then-new
Source engine. It was initially released as a
beta to members of the Valve Cyber Café Program on August 11, 2004. On August 18, 2004, the beta was released to owners of
Counter-Strike: Condition Zero as well as those who had received a
Half-Life 2 voucher bundled with some
ATI Radeon video cards. The game was released on
Steam for Windows on October 7, 2004, and was later included with Half-Life 2 bundles, which were released on November 16 of the same year. The game was developed primarily in-house at
Valve Software, with development contributions from the original co-creators of
Counter-Strike,
Minh Le and
Jess Cliffe, as well as members of the
Day of Defeat development team. Over the next two years, through subsequent updates, they introduced bot support and added several classic maps from previous
Counter-Strike titles like
Inferno,
Nuke and Train that were missing at launch. On November 1, 2006, Valve released a major update entitled Dynamic Weapons Pricing. Under this system, item prices were determined based on their demand the previous week. Even before the system was released, there was opposition from the community, and the system was eventually removed. On March 5, 2010, Valve announced the release of games from its first-party library, including games from the
Counter-Strike series, for
Mac OS X. The ports were slated for release in April 2010. Valve employed
Hidden Path Entertainment to provide support on updating
Counter-Strike: Source. On May 7, 2010, Valve released an update that includes new features and functionality developed in collaboration with Hidden Path Entertainment. These include 144 (now 146) new achievements, a new domination and revenge system, similar to that of
Team Fortress 2, player stats, an upgrade to the
Source engine and more. On June 23, 2010, Valve released the beta to the public alongside the promised OS X version. In February 2013, Valve released a port of
Counter-Strike: Source for
Linux. On February 18, 2025, Valve released the first major update to Counter-Strike: Source in 14 years, upgrading the game from
32-bit to
64-bit binaries for x64 systems. The update also included number of minor graphical, quality-of-life, and bug fixes. == Modifications ==