2K games have confirmed that they have signed an agreement with Steam, the online content delivery system, which will initially see four of their PC titles available for download this week.

The games available will be Sid Meier's Civilization IV, Sid Meier's Civilization III, Sid Meier's Pirates and the turn-based strategy game Shattered Union.

"With titles from legendary designer Sid Meier and 2K's world renowned developer, Firaxis Games, 2K is one of today's foremost publishers," said Gabe Newell, co-founder and president of Valve. "Through this initial agreement with 2K, Steam's game library expands to include four great strategy games. We look forward to delivering more from 2K in the future."

Source: Steam