well because if your xbox live age setting is set below 18 yrs, you are not able to play custom made maps, but you can enter forge mode and create a map and save it, but you cant play it unless you unplug the internet connection cord from the back.
on a shorter note when you sign up for XBOX LIVE, set it to 18 and up.
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u cant
no you cant
Unfortunattly i think you are mistaken!!! on the menu of xbox live in the halo reach game it says playlist and you can choose your playlist
You cant, your destined to die in a firey ball of planet
you cant there are just the primary weapons you have and find until you die