This is Ghost House, the house were all exits were blocked after the infection started. They never checked for survivors....
You are one of those survivors luckily equiped with a shotgun and pistol. You and your friends need to search for the infected and...well, kill them. Use your ammo wisely, stick together and check your corners. The infected are strong and cunning. I doubt many of you will survive....
To be used with the braaaaains gametype.

http://i44.tinypic.com/1zl7hgg.jpg
^Area 1, This is were you and your friends find yourselves^
http://i42.tinypic.com/2vanjpw.jpg
^Area 2, This is were the infected wake from the dead^
http://i43.tinypic.com/312igex.jpg
^All blocked off....^
http://i43.tinypic.com/15304zb.jpg
^Northwest walkway^
http://i41.tinypic.com/99dzbl.jpg
^And from the outside^
http://i41.tinypic.com/2h4aipu.jpg
^Central Walkway^
http://i44.tinypic.com/2088c53.jpg
^And from the outside^
http://i40.tinypic.com/wrj48y.jpg
^Western Walkway^
http://i39.tinypic.com/9se1oo.jpg
^And from the outside...again^
http://i41.tinypic.com/20i9s9v.jpg
^Southern walkway^
http://i41.tinypic.com/53ssi0.jpg
^And from the outside...my new catchphrase :)^

This map gave me and my friends hours of fun, so downloads it and get hooked.

Download

http://www.bungie.net/Online/Halo3UserContentDetails.aspx?h3fileid=101535188