Team Fortress Classic
The first major "Quake" mod was "Team Fortress". This mod consists of Capture the Flag gameplay with a class system for the players. Players choose a class, which creates various restrictions on weapons and armor types available to that player, and also grants special abilities. For example, the bread-and-butter "Soldier" class has medium armor, medium speed, and a well-rounded selection of weapons and grenades, while the "Scout" class is lightly armored, very fast, has a scanner that detects nearby enemies, but has very weak offensive weapons. One of the other differences with CTF is the fact that the flag is not returned automatically when a player drops it: running over one's flag in "Threewave CTF" would return the flag to the base, and in "TF" the flag remains in the same spot for preconfigured time and it has to be defended on remote locations. This caused a shift in defensive tactics compared to "Threewave CTF". "Team Fortress" maintained its standing as the most-played online "Quake" modification for many years. Team Fortress would go on to become "Team Fortress Classic" and get a sequel, "Team Fortress 2".