Neat! (downloading now to get a closer look).
Which reminds me that
Marathon went "free" ages ago, and a few OSX versions have been ported. I never tested any *real* OSX version, simply running in Classic instead (back in Jaguar maybe). I was utterly hooked on the whole Marathon trilogy (starting around 1995?), and its various scenario-spinoffs (Siege of Nor'Korh, Tempus Irae, Rubicon, Marathon RED and Marathon EVIL).
This link should be a good starting point:
http://source.bungie.org/get/[the original developers were lured away from the Mac platform by Micro
$$$oft to create Halo for the Xbox.]
