A couple of years ago I made a video talking about megatextures, which is the technology behind Rage. At the time I noted that Rage was a little over 20 gigabytes in size, mostly due to the unusual way megatextures work. That's big. For comparison, it's more than double the size of contemporaries like Dishonored, Sleeping Dogs, Far Cry 3, Spec Ops: The Line, Saints Row The Third, and BulletStorm. It's not the largest game or anything, but as more of the market moves to digital distribution, having a game be double the norm is notable.