SteelSeries, the leading global manufacturer of gaming peripherals, today announced a new partnership with Valve Corporation, entertainment software and technology company and creator of the popular Steam platform and award-winning properties such as Half-Life, Counter-Strike, Team Fortress, Portal and Left 4 Dead. Through a multi-title agreement, SteelSeries will work closely with Valve to design co-branded gaming surfaces, specific for Valve's most recognized game titles.