can you create custom maps in halo 3?

[Andrew G]

because i heard in halo 1 you could but what about halo 3
if you can, can you add and take away things such as vehicles, weapons, power ups, and equipment?

 

[hartleydogg]

You can modify objects in maps that are already created. You cannot modify the terrain or building placement. However you can place weapons, grenades, powerups, etc.