TransGaming’s Cider allows Mac users to play Windows Games. Cider is a sophisticated portability engine that allows Windows games to be run on Intel Macs without any modifications to the original game source code.  Cider works by directly loading a Windows program into memory on an Intel-Mac and linking it to an optimized version of the Win32 APIs.  Games are simply wrapped up in the Cider engine and they work on the Mac.  This means developers only have one code base to maintain while keeping the ability to target multiple platforms.