Wanna play Steam games on a Mac? Have you tried Porting Kit?

With Porting Kit you can install many Windows games in your Mac, and that includes some Steam Windows games (including big ones like 'The Elder Scrolls V: Skyrim'). Wanna check it out? Visit us! Download it! Play your favorite Steam games on your Mac!

Note: You must have the Windows game in your Library in order to install/play it.

Official Website[portingkit.com]