downloaded it from the downloaded content
it may be free by now.....
in sandbox mode
Forge.
Buy it using Microsoft points
For Halo 2 on PC there in lots of custom maps such as Vertigo 3, New Mombasa, and Halo sandbox beta 3.
Either buy the mythic map pack (worth 800 ms points) or get the multiplayer disc that comes with Halo 3: ODST.
assembly orbital and sandbox are apart of the mythic map pack so on April ninth download and find them*Spoiler Alert*Assembly-Orbital-Sandbox Skulls-http://www.youtube.com/watch?v=tYZhcJUzh98as for longshore, citadel, and heretic, you will have to wait for Halo: ODST. Sorry.
The maps are Assembly, Orbital, Sandbox, Citadel, Longshore and Heretic.
Im pretty sure but not 100%, but its when the map has the same thing on eachside, like standard sandbox
Go to the map Sandbox. Check if you are using forge. Use 2 double walls and 2 blocks.
halo wars comes out march 3rd. halo ODST comes out sometime in fall. (in case any of you were wondering, halo 3 recon has had it's name changed to halo ODST.) halo wars comes with assembly, orbital, and sandbox while halo ODST comes with heretic, longshore, and citadel. YOU MUST BUY THE LIMITED EDITION!!!
It will have a different campaign mode and all of the halo 3 maps but it will also come with both halfs of the Mythic Map Pack (Assembly, Orbital, Sandbox, Citadel, Heretic, Longshore).
Sandbox - 2012 Best of Sandbox 3 - 1.46 was released on: USA: 24 January 2013