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Multiplayer Online Split-Screen Support
Lets get started with what I believe is the most unknown, yet confirmed, aspect to Call of Duty: Black Ops Multiplayer -- the online split-screen support weve re-introduced to the franchise! This applies to both the Xbox 360 & PlayStation 3.

The Facts:


You can connect a 2nd controller and bring a Guest online (i.e. Player" & "Player(1)").
Guests can rank up, earn unlocks, etc -- all Guest progress goes away once signed out.
(Xbox 360 only) You can bring a 2nd, Gold Xbox LIVE account online!
(Xbox 360 only) Both players with full online accounts can rank-up while playing split-screen, as if on two separate consoles.

Custom Games Editor
Allow me to introduce the Black Ops Custom Games editor! Private Matches have never been this customizable. Players will have the ability to structure their games at all new levels of granularity. From variables as simple as Time Limit and Score Limit, or as deep as which weapons, Perks, and gear is available. You want a Pistols Only match? Make one! No longer do custom game modes rely on the "honor system".

Furthermore, any Custom Game you create and configure can be placed in your File Share, for friends and the community-at-large to browse, download, and enjoy. You just might create the most addictive new game mode of all time from the comfort of your own living room!

In-Game Friends List
Weve integrated a built-in Friends List into the in-game User Interface. Youll be able to browse Recent Players, Friends, navigate their File Shares, Recent Games, Combat Records -- all within this in-game menu system designed to streamline the social process within the game. Sending game invites and joining Friends games has never been simpler than in Call of Duty: Black Ops.

Regional Matchmaking & Party Privacy
Call of Duty: Black Ops will support regional matchmaking filters on a global scale. So, no matter where youre at in the world, you will have the ability to specify whether you want to match with players from other geographical regions, or only those local to you. This will make communication and lag a much less intrusive variable on your gameplay experience.

Additionally, given Black Ops will support joining games in progress via an even simpler built-in in-game Friends List interface, well allow a Party leader to lock down his lobby to Invite Only, Friends Only, or even Close it altogether if he wants to be in complete control over who enters and exits the Party Lobby.

Emblems Do NOT Reset with Prestige
This one is pretty cut-and-dry -- a frequently asked question is, "Will my kickass emblem I spent hours perfecting be lost when I prestige??" The answer is, "NO!" -- Emblems are one of the only aspects of Black Ops MP that do not get a full reset upon entering Prestige. Things that will reset when you Prestige are: XP, COD Points, Challenge progressions, Loadouts, etc.

So thats just a few of the lesser-known components to Call of Duty: Black Ops MP, officially confirmed in one location! What I just described applies to the Xbox 360, PlayStation 3, and the PC -- except for the Split Screen Online play, Regional Matchmaking, and Party Privacy. Thats just 360 and PS3.
Sources-Callofduty.com