Unfortunately, the binaries are compatible only with PowerPC Macs, and as a result, you will be able to play Halo only on OS X builds featuring the Rosetta dynamic binary translator that allows users to run PPC applications on their Macs.
The game was first launched on Novemfor Xbox, and later on, in 2003, for Mac.
Halo: Combat Evolved is a sci-fi shooter and the game that started the Halo franchise.