Call of Duty: Continue to Create the New Sales Milestone

Call of Duty was presented as part of its 2010 Electronic Entertainment Expo in June. It attracts many players. Activison said, the top-rated shooter from Infinity Ward had sold 20 million units worldwide.Now, that same milestone has been passed by the Call of Duty franchise's downloadable map packs. Today,lifetime-to-date sales of the add-on arenas have surpassed 20 million units.

The success hasn't been without casualties, however. The problems surfaced in March, after Infinity Ward cofounders Jason West and Vince Zampella were fired. After their dismissal, the pair sued the company, which sued back, alleging they had been plotting to start a new studio with chief Activision rival Electronic Arts. Within weeks, West and Zampella did just that. A number of Infinity Ward developers jumped ship to join the new studio, dubbed Respawn Entertainment, while others simply resigned.