yes , on PC or x box?? on PC i think so
See halomaps.org for mods like sonic for halo. It is only for Halo Custom Edition, but you can convert it to Trial or Retail with Pearl or Demo with Queene Anne's Revenge.
As of now the Halo: Reach beta is gone, your not going to be able to.
There are no cheats for halo 3 there are only mods and hacks
There are no cheat codes for Halo, only mods.
You can only do it on HALO 1 on the Computer with mods.
probably not the only map on halo trial is blood gluch or gulch whatever any way the halo combat evolved has been discontinued but you can buy it cheaply at some stores i did
You have to download a different version then try again. this is why you dont play halo on the stupid computer. only noobs play on the computer. because when you use a mouse you can easily turn around faster than a controller.
If You Mean change into elite, no, you can only do that in Halo 2, 3 and Halo Reach. But however you can use mods at halomods.com
No, at least not in the vanilla game. It is only achievable by mods.
Only "Give them hell!"
Only the word hell
no, all there is not any flood in halo 3 odst firefight