Hearts of iron 4 is a WW2 (and WW1) grand-strategy simulator. That is, take the role of Stalin, Hitler, Roosevelt, Churchill or a hundred different leaders, and create your path to victory in the great wars.
It's pretty easy to get into but pretty difficult to get 'good'. (still working on it!)
Anyways, for those of you who know or want to know more you can post here and I'll answer questions. I'd be down for getting a multiplayer game going with people.