Once upon a time a
Half-Life mod maker named Minh "Gooseman" Le launched the first version of his multiplayer mod
Counter-Strike. The team based gameplay was something totally different than the normal deathmatch or capture the flag modes and its popularity grew and grew until
Counter-Strike became far more popular to play than
Half-Life.
Half-Life's creators
Valve bought the
Counter-Strike mod and turned it into a full fledged commercial title.
Counter-Strike is still one of the most popular games to play online 10 years after the first mod release.
While Le worked with Valve for a while (which apparently included some time on a canceled
Counter-Strike sequel) he eventually decided to leave Valve to work on a totally original game. IGN now has the first brief preview of that game with the somewhat ungainly title
Tactical Intervention. While there are apparently similarities between Counter-Strike and the new game (both are team-based shooters) there are new elements such as AI civilans that react to events and can be taken hostage. Rounds are also faster than in Counter-Strike (around two minutes on average). The game is expected to go into beta testing "soon" with a released planned for the end of 2009.
Update:
4Gamer.net has some new (and watermark lacking) screenshots from the game that we have reproduced here