Final Fantasy XIII
I had a rough idea the whole way through, but they through you in as if you already know everything, and never really explain any of it either. I was literally playing final boss, and a bunch of friends who had never seen any of the game happened to show up as I started, and they were looking on oh so confused and I told them not to worry, I didn't understand what was going on either and I played the whole game lol

THE JACKEL