In order to accomplish objectives efficiently, a balance of these classes is required due to how these strengths and weaknesses interact with each other in a team based environment.
Although the abilities of a number of classes have changed from earlier Team Fortress incarnations, the basic elements of each class have remained, that being one primary weapon, one secondary weapon, and one melee weapon.
The development is led by John Cook and Robin Walker, creators of the original Team Fortress.
It is the sequel to the 1996 mod Team Fortress for Quake and its 1999 remake, Team Fortress Classic.The BLU team wins by pushing the bomb cart to the last checkpoint, while RED team wins upon defending until the time limit runs out.King of the Hill is another core game mode, that contains a single control point that can be captured by both RED and BLU teams.After Valve released no information for six years, Team Fortress 2 regularly featured in Wired News Valve continues to release new content, including maps, items and game modes, as well as community-made updates and contributed content.In June 2011, it became free-to-play, supported by microtransactions for in-game cosmetics.The intelligence can only be picked up by the opposing team.The first team to capture the intelligence three times wins.Control Points is a game mode where there are several control points laid around the map, typically 3 or 5.For a team to win they must capture all the control points within the time limit.New sets of class-specific achievements have been added in updates, which add new abilities and weapons to each class once unlocked by the player.This unlockable system has since been expanded into a random-chance system, where the player can also obtain the items simply by playing the game. These include Capture the Flag where the BLU and RED teams fight to steal each other's intelligence (represented in game as a briefcase) and return it to their base.