Call of Duty: Modern Warfare 2 and Call of Duty: Modern Warfare 3 Released for Mac

Both games feature Steam Play support and cross-platform competitive play
The full versions of both games, including all available DLC Packs for each, are available via digital download through the Steam platform and can be purchased directly from Steam, Aspyr's online store GameAgent.com, and other participating online Mac game retailers. Players are encouraged to head over to GameAgent.com and utilize the site's "Mac Match" feature to automatically determine if their Mac meets the games' system requirements.
Aspyr Media also delivered the first in the series, Call of Duty 4: Modern Warfare, to the Mac in 2008, which has remained a popular shooter on the platform since.