Fortress Forever is an unreleased Half-Life 2 mod that uses the game's Source Engine. The game is based on Valve's Team Fortress Classic, but has been created entirely from scratch by the Fortress Forever development team. The intended scope of Fortress Forever is to please the adamant Team Fortress Classic fans, while at the same time creating a game enjoyable enough to players new to Team Fortress styled games. The developers have promised to make the game available for free to all who have purchased Half-Life 2. Currently there is no set date for the release of Fortress Forever. However there's a news post which mentions the year 2007.