the universal binary from here:
size: 41.2 MB (43,173,443 bytes)
Click on the download link above to download the game.
After download is completed, open the dmg file and follow the onscreen
Notes for users with Mac OS X 10.8 and Retina displays
If you have one of the new Macs with a retina display, you may run into issues with the game in fullscreen mode (which is the game's default mode). Some customers have reported that the screen is cutoff and the mouse cursor coordinates are wrong. This is a known issue with the SDL library that we use for graphics and mouse input, and it hasn't been fixed yet.
However, there is a workaround: disable the automatic graphics card switching in the energy saving preferences.