This is literally the most amazing game idea I've ever seen. The game is only beginning to be developed and it's predicted to come out in a few months in the first alpha version. What it basically is is a game about humanity and how we progressed from cavemen to what we are now and beyond. There are no NPCs besides animals and there is nothing like a "world wide trading system" (unless someone invents it) It's planned to start out in the stone age and in order to progress through the ages players must invent and create tools and means of getting supplies. There's so much more to it than I can explain in a post so just click this link http://lnc.hr/bMB0 and watch the video it is simply amazing.