Steam has confirmed it will bring its digital distribution service Steam to Mac this April.
The service will launch with a variety of games from Valve's library, including Left 4 Dead 2, Team Fortress 2, Counter-Strike, Portal and the Half-Life series.
The newly-announced Portal 2 will be Valve's first simulaneous Mac and Windows release when it arrives this Christmas.
The launch of the Mac edition will introduce a new feature called Steam Play, which works in conjunction with Steam Cloud to allow consumers to play their purchased games on both PC and Mac free of charge.
"As we transition from entertainment as a product to entertainment as a service, customers and developers need open, high-quality Internet clients," said Valve president Gabe Newell. "The Mac is a great platform for entertainment services."
Director of business development Jason Holtman added: "Our Steam partners, who are delivering over a thousand games to 25 million Steam clients, are very excited about adding support for the Mac."
Valve has previously teased this announcement with a series of teaser images parodying familiar Apple ad campaigns.