Three months later on May 3rd, 2011, Treyarch (developer of Black Ops) came out with its second map pack add-on to Call of Duty Black Ops. Their first add-on was called First Strike which was a huge success. The Escalation map pack has five maps which consist of Zoo, Hotel, Convoy, Stockpile, and the zombie map Call of the Dead.
Zoo is a great map for short-range weapons such as shotguns. The main flag is planted right in the middle of a small plaza area inside an abandoned zoo. You can shoot down the flag from either side and enter the plaza from four directions. There are a couple of good spots for snipers but the map mostly favors close combat.
The Hotel map is pretty similar in difficulty to control the main flag in Zoo. There are long distances where you can snipe at enemies from above. You can shoot down on a drained swimming pool from a second-story window, but you have to be wary of snipers shooting from a similar window on the other side of the complex. Furthermore, there are elevators you can call and enter. If you stay inside, you can be pretty safe from helicopter, mortar and napalm attacks.
Convoy has a similar set up as you square off on multiple levels of a freeway where trucks have been overturned. The setting is a U.S. army convoy that has been hit by a Soviet ambush on a freeway where you fight amongst the wreckage.
On the other hand, the Stockpile map lets you fight for control of a key building in the middle of a Russian town. The fight for control of the main flag takes place inside one of the buildings where you have to fight in a fairly cramped space. Once your side grabs the flag, you can run up to the automatic garage doors and shut them to make it harder for the enemy team to take the flag back. Overall, this map has a lot of flanks but controlling the garage doors is the key to victory.
Call of the Dead is the new zombie map which consists of celebrity characters such as George A. Romero, Robert Englund, Sarah Michelle Gellar, Michael Rooker and Danny Trejo. In Zombies, you try to survive endless waves of attacking zombies. Many people have complained about Call of the Dead because of the new enemy George Romero, who follows you throughout the map. There is a way to kill him so that he will not follow you but is very difficult.