A team of 1000 engineers, scientists, and survivalists are dropped in an uninhabitable but fertile land. They have only the clothes on their back and a few bags of high-yield seeds, the product of thousands of years of selective breeding. Their tasks is to build a computer that can render 3D graphics well enough to run a 3D platformer game. Before being dropped they are given every relevant textbook and ample time to commit its most important points to memory. How many years (or generations) does it take until they pull it off?