Please be more specific next time. If you mean Halo 3 mission, the coolest would be the last one, Halo, because everyone is blowing up. If you mean "Is halo 3 the coolest Halo game?" no, Halo Reach is.
There are no cheats for consoles.
Depends on your definition of cool. It is an opinion.
Call of Duty, Assassins Creed 3,and Halo
it is the coolest game ever, well behind call of duty 4 and 5
Depends on your definition of cool. It is an opinion.
All the armor are the same it's just the way how you want to look WRONG! the best armor in halo 3 is the recon armor and you have to be a member of bungie OR get all 7 vidmasters in halo 3 ODST
I personally like the EOD but most people don't.
Link, from the Legend of Zelda series, is by far the the coolest videogame character ever. The Master chief, John 117, from Halo, comes second.
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.