S4 League is a third-person shooter multiplayer game developed by Pentavision in 2008. It is currently hosted in Europe by alaplaya(although people located outside of Europe are allowed to play it, too.) and by Pmang in Korea.
The title of the game comes from the four "S" words defining this game: Stylish, eSper, Shooting, and Sports. eSper refers to the 'skills', powers held by characters within the virtual world setting of the game.