original question: What is the gameplay mode of [World of Warcraft: Wrath of the Lich King]?
answer: multiplayer video game
answer type: Gameplay Mode.
auxiliary information: World of Warcraft: Wrath of the Lich King, often referred to as WotLK or Wrath, is the second expansion set for the Massively Multiplayer Online Role-Playing Game World of Warcraft, following The Burning Crusade. The game added a substantial amount of new content into the game world, including the new continent of Northrend, home of the eponymous Lich King and his undead minions. In order to advance through Northrend, players are required to reach a new maximum level of 80. There is also a new 'hero' class, the Death Knight that starts at level 55.
[World of Warcraft: Wrath of the Lich King] is played in which gameplay mode?