how do you play halo 3 coop on legendary mode? (ONLINE)?

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i wanna play online halo 3 and beat legendary, how do u do it?

 

[Patrick S]

To play online storyline you go online as usual go the play ist selection.. pick campaign and invite people to your group.

All you need to know is on this page
http://majornelson.com/archive/2008/09/23/xbox-live-service-maintenance.aspx
On Monday, 9/29/2008 from 12:01 AM PST for up to 24 hours, Xbox Live will be offline for maintenance. As a result, Xbox LIVE and the ‘My Xbox’ section of Xbox.com will be unavailable, and the Xbox forums will be in read only mode (you won’t be able to post.) The remainder of Xbox.com will be available with limited interruptions.

This service maintenance is in preparation for the new Xbox experience which will be available later this fall.

Let me reiterate: When the service returns, you will not have any new features and you will not have the new Xbox experience update. That will happen later this Fall.

As usual, I’ll make a post and update my Twitter when the service returns.

Major Nelson is basically the xboxlive spokesperson.. Microsoft makes him tell the news through live.

 

[Amy S]

You gather 3 of your friends, hop online and party up. Switch lobbies to Co-op mode and set the parameters for Legendary. =]

Can't do it today, XBL is updating.

 

[Moose]

you have to go to the campain page and just invite a friend