Counter-Strike: Source is a tactical first-person shooter video game developed by Valve and Turtle Rock Studios. Released in October 2004 for Windows, it is a remake of Counter-Strike (2000) using the Source game engine. As in the original, Counter-Strike: Source pits a team of counter-terrorists against a team of terrorists in a series of rounds. Each round is won either by completing an objective (such as detonating a bomb or rescuing hostages) or by eliminating all members of the enemy team. The game was initially bundled with all retail and digital copies of Half-Life 2, before being released standalone. Gameplay Counter-Strike: Source retains its team-based objective-orientated first-person shooter style gameplay. The aim of playing a map is to accomplish a map's objective: defusing the bomb, rescuing all hostages, or killing the entire opposing team. The ultimate goal of the game is to win more rounds than the opposing team. Once players are killed, they do not respawn until the next round, though this depends on which server people play on. This gameplay feature distinguishes Counter-Strike from other first-person shooter games, where players respawn instantly or after a short delay. Shooting while moving dramatically decreases accuracy, and holding the trigger down to continuously shoot produces severe recoil. The severity of damage induced by weaponry is dependent upon the specific locations of hits, with hits to the head being most lethal and shots which make contact elsewhere causing lesser loss of health. Damage is also affected by the distance, and if the target wears protection. Development Counter-Strike: Source 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 included with Half-Life 2 bundles, which were released on November 16, 2004. On October 11, 2006, Valve released an experimental update entitled Dynamic Weapons Pricing. Under this system, item prices are determined based on their demand the previous week. 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