Seven players take control of seven nations. You can move around your armies and fleets trying to take supply centers but if you really want to get anywhere, you're going to need to ally with someone.
And then if you really want to win, you're going to have to backstab that sucker so skillfully that they'll never recover.
This is a game of persuasion, a game of lying, a game of backstabbing. It also seems to be a game of reading everyone else's mind as you figure out who is trustworthy and who is a liar.
It's an amazing game but don't play it with whiners who get emotionally invested in the game. I've heard many reports of tears and boards being flipped after people getting backstabbed. I haven't seen it myself but I still suggest on choosing your players carefully. You don't want them to cry after you stick the knife in.