Today sees the arrival of the first map pack for Call of Duty: on the Live Marketplace.

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As per the deal struck between and Activision, all for games over the next two years will be a timed exclusive on the giving owners of the console the first shot at the latest maps.

The packs will be available from today for 1200 MS points (around 9.99 GBP) and contains five maps, Berlin Wall, Discovery, Kowloon, First Strike and the zombie level, Ascension.

Treyarch boss, Mark Lamia said: "Our fans mean everything to us so we are thrilled to be able to provide the Black Ops community with exciting new gameplay that will extend their multiplayer and Zombies experiences. The team has given it their all, as we crafted the maps in First Strike while taking into account our community to make sure that this content delivers compelling and unique experiences that will appeal to all different play styles."

If the 2 DLC is any indication, First Strike should arrive on and in around a month's for a little bit more than the Xbox 360 version, around 10.99 GBP.

By Ewan Aiton