https://www.gamespot.com/articles/new-fortnite-mode-solo-showdown-available-now-for-/1100-6459030/

In addition to the ongoing 50v50 event, Epic has kicked off a new limited-time mode in Fortnite: Battle Royale. For the next few days, players across PS4, Xbox One, PC, and mobile will be able to take part in the Solo Showdown, a limited-time competition to determine the best Battle Royale player.

Unlike previous limited-time modes, Solo Showdown doesn't feature any gimmicks or changes to the underlying gameplay. Rather, it's an ongoing contest against other self-selected players in what Epic calls "the ultimate test of survival." Players compete to earn a spot on the standings, and those with a high enough score by the end of the competition will be rewarded with a huge prize of V-Bucks.