You can only get the Halo games for the Xbox360.
Xbox 360
There are many platforms that support Halo I. These include the Microsoft XBox, Microsoft Windows, and the Mac OS X. This is an older version of the latest release, Halo 4.
You have to play them both to see. We cannot tell you your own opinion.
No, Halo is purely a Xbox game, and not on any Sony platforms.
The Halo games are only available for the original Xbox and the Xbox 360 made by Microsoft.
The Halo Series is exclusive to the Xbox 360 and will not be out in any other platforms
halo 3 obviously
Halo 3: ODST is the newest of the two, but not the newest Halo game.
The halo time line goes Halo Wars, Halo: Reach, Halo:CE (halo 1), Halo 2, Halo: ODST, Halo 3. Halo 3 and ODST are practically at the same time.
After Halo 3 there was halo wars, halo 3 ODST, and Halo reach. A new company (not Bungie) will be making a Halo 4 and rumor has it there will be a remake of Halo Combat Evolved.
Halo 3 ODST is not for PC but Halo 1 and maybe Halo 2-3 are
it goes halo, halo 2, halo 3, halo 3 odst and soon halo reach will be available