Halo 2 rex glitch

Start up campaigne on the level Outskirts, when you start the level as you walk through the first "doorway" jump onto the light and from there jump to the roof as you would to get the blind skull. Instead of going toward the skull go the opposite way and jump across a small gap. Walk forward unti you hit a invisible barrier. Here grenade jump onto the wall to the side of you. From there proceed to your left making jumps where you need to, the basic point is just to keep going in a strait line. You wil eventualy come to a broken bridge, here you will need to jump on the the "railing" of the bridge and crouch jump or grenade jump on to the building. From this point proceed forward and look for a blown open whole in the roof. Once you have found this go down into it and there will be and energy sword on the ground and in rocks the nam REX is spelled out (one of the lead producers of bungie.)

Congrats, you have finished the REX glitch.