Escalation is a downloadable content pack (DLC) for the 2010 game Call of Duty: Black Ops. It includes four new multiplayer and one new zombie map:- Zoo (takes place at an abandoned Soviet zoo)- Convoy (takes place near an abandoned convoy containing a big missile)- Hotel (takes place in a resort in Cuba)- Stockpile (takes place in a small village in Russia with one of the houses containing a stockpile of weapons)- Call of the Dead (the zombie map taking place in an abandoned Siberian outpost near the coast)