halo is only on xbox 360
Yes.
Yes, you can play Halo 2 online on the Xbox 360 using Xbox Live.
Yes, specifically, you need a Xbox Live Gold Account to play most xbox 360 games online, including Halo 3.
No. You can play Halo Reach on the old Xbox 360 consols.
Halo 1: Xbox, Xbox 360, & PC Halo 2: Xbox 360, & Windows Vista Halo 3: Xbox 360
They stoped online play for Halo 2 back in June 2010. And you need Xbox LIVE to play halo 3, however on the new Xbox 360 u can play halo3 online for free
Yes, you can play Halo 2 on the Xbox 360, but it requires the original Xbox version of the game and is not available as a standalone title on the Xbox 360 Marketplace. The game is backward compatible, so if you have the original disc, you can insert it into the Xbox 360 to play. However, online multiplayer features are no longer supported.
Yes, If you have the Halo Ce disk for xbox (It's 360 compatible) and the halo 2 disk (also compatible)..don't expect halo 2 to have online play via xbox live anymore though. They shut down all original xbox game severs down a while back.
Yes And No, xbox 360 games can't be played on the xbox and only some xbox games can be played on the 360. All of the newer games are made for the 360. But you can Hack both of them and play some Xbox games on the Xbox 360 like Halo 2 for example you can play online with Halo 2 on the Xbox 360.
Well, halo 2 is a xbox oringanils but is not avalible for download. but still you can play halo 2 on your xbox 360 if you buy it at a store, or order it online.
If you are referring to an "older xbox" as the regular xbox, then the answer is no. but if you are referring it as the first models of the xbox 360, then you can play halo 3 or any new xbox 360 games on your Xbox 360.