I play alot of Europa Universalis 4, if you're into grand-strategy you might want to check it out. It can be played both singleplayer and multiplayer. The good part about multiplayer is that you wouldn't need to buy any DLC, if the host has it, you will have it too during that game (I can host games with all DLC).
So, whats the game about?
The game starts in the year 1444, you can choose any country in the world and lead it to greatness (Or get wiped off the map within a few years)