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one2tribe is a company specializing in the mobile solutions creation designed for large communities and the developer of The Witcher: Versus. It was set up in 2003 in response to the market changes and arrival of the new wave of Internet and mobile solutions based on the community trends (so-called Web 2.0, i.e. weblogs, massive multiplayer games, instant messaging). The firm employs IT specialists, but also sociologists and psychologists.
The Witcher: Versus is a Flash-based multiplayer fighting browser game, developed for CD Projekt RED by one2tribe and launched in 2008. The game has you create a character from one of three classes and challenge other players to deadly battles. When you first sign up for Versus, which is tied into your thewitcher.com forum account if you have one, you choose from one of three character classes: Witcher, Sorceress and Frightener.
As of May 2012, this game ceased to be associated with The Witcher franchise and CD Projekt RED.