Medieval II: Total War - Kingdoms is a strategy game from Creative Assembly. Medieval II: Total War - Kingdoms is an expansion pack to the previous game Medieval II: Total War.
This expansion adds about four new standalone campaign that focus on their own theater. There is the American campaign where you can play as the Spanish and try to conquer the new world or play as the native tribes such as the Aztecs and drive the Spanish invader back to the sea where they came from. There is also the Crusader campaign where you can play as the Crusader States or as Saladin. The rest are the England campaign and the Teutonic campaign. Each of these standalone campaign offer unique Total War experience as they are very focused on each campaign.
So overall, Medieval II: Total War - Kingdoms is a good expansion pack. The campaign are more focused and make it more interesting. I recommend this.