Medieval II: Total War: Kingdoms

Medieval II: Total War: Kingdoms is the expansion pack to Medieval II: Total War, released in 2007 for Microsoft Windows. It was developed by The Creative Assembly, who also developed the original game. Ports for both macOS and Linux would be released in January 2016.

Plot
The game is divided into four campaigns:
 * Americas Campaign: It is 1521 AD, and the European colonization of the Americas is underway. The Europeans, such as New Spain, England, and France attempt to claim the continent for themselves, while the Native Americans such as the Aztecs, the Mayans, or the Apacheans attempt to stop the foreigners... while fighting each other at the same time.
 * Britannia Campaign: In 1258 AD, the kingdoms of England, Scotland, Norway, as well as Irish and Welsh rebels, wage war for control over the British Isles. To further complicate matters, an alliance of dissident English barons are also intent on rebelling against the English throne...
 * Crusades Campaign: 1174 AD. Years after the failure of the Second Crusade, the Crusaders of Jerusalem and Antioch continue their fight against the Muslim Seljuk and Ayyubid dynasties. To the north, the Byzantine Empire has to contend with not only the Turks, but also the Venetians. And what are the odds for a horde of nomadic warriors to arrive from the east?
 * Teutonic Campaign: 1250 AD. Lithuania is the only European faction to not embrace Christianity, which prompts the Teutonic Order to start a Crusade to convert the Pagans. However, the Teutonic Knights are not only a threat to Lithuania, but to the other factions as well, such as the Orthodox Republic of Novgorod, and even other Catholics also, such as Poland. Meanwhile, to the west Denmark intends to unite all of Scandinavia, which puts them at odds with the Holy Roman Empire...

Why It Rocks

 * 1) Lots of additions to the game, such as new factions and units.
 * 2) Four unique campaigns with their own features, while retaining much of the Grand Campaign's gameplay.
 * 3) All these campaigns can be challenging, even for the factions that are estimated to be easy.
 * 4) Many great mods, such as Stainless Steel or the The Lord of the Rings-themed Third Age: Total War.

Bad Qualities

 * 1) The campaigns are divided into four separate mod folders and ultimately doesn't add to the original game's Grand Campaign. This also makes it impossible to play a Custom Battle involving one new faction (eg. Ireland from Britannia) against another from a different campaign (eg. the Apacheans from Americas). Some mods have been released to rectify this issue, such as Kingdoms Grand Campaign Mod and Expanded Americas.
 * 2) In the Steam version, mods are rather hard to launch without crashing.