Halo: Combat Evolved is a sci-fi first-person shooter created by Bungie Studios for Microsoft and released for the Xbox in 2001, then ported to Windows and Macintosh by GearBox in.
Fucking unbelievable, I'm going through a divorce so didn't use my computer (a 2007 mac pro - 10.6.8 is the latest OS I can run) for six months.
Link for steam community and this works for any Computer.
