4Kings had players competing in  first-person shooter video game published by who?
4Kings: 4Kings or Four Kings was a professional computer game esports clan/team based in the United Kingdom. Return to Castle Wolfenstein: Return to Castle Wolfenstein is a first-person shooter video game published by Activision, released on November 19, 2001 for Microsoft Windows and subsequently for PlayStation 2, Xbox, Linux and Macintosh.
i don't know