This is a single player scenerio that starts you off with a lot of units, and you have to come up with a way to attack the enemy city.
There are 5 different difficulty settings: (Use the different scenerios as difficulty not the AOE difficulty system) Easiest, Easy, Standard, Hard, and Hardest.
As you beat one you should play the next difficulty and so on. Have fun! You should start with easiest... as you beat that go to easy... then standard.. then hard.. and finally hardest (good luck beating hardest ;)
Nice basic square city siege...but I thought difficulty modes meant in game....still fun for a few minutes though...you should try something more elaborate next time...with more eye candy and elevation...