While some play on console systems like the Xbox and PlayStation, many are playing it on PC, because that version offers mod support. You may already own it: Bethesda Softworks, the game’s publisher, announced that they had shipped 12 million units of the game “representing sales in excess of $750 million” (shipping, it should be noted, is a different metric from sold).

You may already know this, since the game has been the subject of a pretty heavy media blitz before launch. Fallout 4, the newest blockbuster role-playing video game, came out last week.