Fortnite's battle royale mode was designed in the back of an Uber car on the way to a meeting.Former Fortnite boss, Donald Mustard, revealed that the decision to add the popular mode was made during an Uber ride in mid-2017.The idea came up in a conversation between Mustard, Tim Sweeney, Paul Meegan, and Kim Libreri.Mustard quickly wrote up a one-page design document for Fortnite's Battle Royale during that car ride.