SWAT 4 is a tactical first-person shooter video game developed by Irrational Games and published by Vivendi Universal Games on April 5, 2005. It was built on Irrational Games's Vengeance Engine powered by Unreal Engine 2 technology. In SWAT 4, the player leads a SWAT tactical element in resolving various situations, such as hostage standoffs or apprehensions of dangerous subjects. An expansion to SWAT 4, entitled SWAT 4: The Stetchkov Syndicate, was released on February 28, 2006. On January 24, 2017, it was released digitally on GOG.com.
An expansion pack for SWAT 4 titled SWAT 4: The Stetchkov Syndicate was released on February 28, 2006 in North America and on March 10, 2006 in Europe. The expansion includes seven new missions featuring the fictional Stetchkov crime family.
VoIP capability has been added to multiplayer games, there are seven new missions, two new multiplayer modes, seven new weapons, players may strike suspects or hostages to prompt compliance, which has the same effect as a non-lethal weapon, suspects will now pick up their weapons if they are not swiftly arrested, 10 player co-op with up to two teams of five, stat tracking, ladders and rankings for multiplayer, orders can be held in single player until the leader gives the go command and an option to have only one person issue commands and lead the team.