Introduction of MOD
Some players may modify the game and make some patch files. It often changed some of the properties, increasing the country, unit, building, or battle, tasks, and picture modification.
There have been many players modified, they made some MODs. This site contains a number of MODs. Some of these MOD is very perfect, can be used as a separate game, some MOD is a semi-finished product, but you can experience, and some MOD only modified a few properties, can be regarded as a patch class.