In 2017, Fortnite burst onto the scene as an early-access title as a tower defense title with crafting-survival gameplay elements. It didn't make many waves with this mode, though it did have quite the following, but that would all change when the Battle Royale mode arrived on the scene a few months later. While the free-to-play Battle Royale has become a cultural phenomenon, the base mode (Save The World) quickly petered away. It never grew as popular as the Battle Royale, but the PvE campaign was a crucial milestone in Fortnite's journey to success.