CPU AI is not changed in UFC Undisputed since 2010 in difficulty mode. I was very happy when I came to know about the simulation mode. But really itís very bad when I saw that the CPU AI is not good when they bombarding and when they come forward it starts lagging a bit. As I am not able to understand why they have not used the customized setting of the game as used by other games. As Simulation Mode is a good idea but only when it is made real. And as the before game this game has also over aggressive AI which is not good.