Treyarch's launched title update 11 for Call of Duty: Black Ops on Xbox 360.

According to the developer it features a number of unidentified security updates, plus audio tweaks when planting and defusing bombs in Search and Destroy mode.

Call of Duty: Black Ops became the best selling game in UK history last month.

Treyarch recently dropped hints that a fourth map pack is in development for the shooter, following the June launch of the Annihilation DLC on Xbox 360.

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