This challenge is part of Fortnite Season 4 Week 5 Challenges and you'll have to collect the four blue rings that levitate above the rooftops of Coral Castle. Several similar challenges have been published previously for other locations on the map. Here you'll have to visit the city that was once called Atlantis.
Map
All the rings without exception are located at the top of the towers or on the roofs of the place. You'll be able to catch the first ring without difficulty directly from the fall of the battle bus, but you'll then need materials to get to the next ones.
Note that the blue rings are also collectable in Team Rumble. The advantage is that in this game mode you'll have a few hundred resource units to build a few stairs right from the beginning of the match. As a bonus, there will be fewer enemies, and if they kill you while you haven't finished the challenge, you can relive it over and over again!
If you still prefer to play in the battle royale mode, nothing prevents you to go to the location late in the game. During the week following the release of this challenge, Coral Castle will be the scene of violent clashes at the beginning of the game, as many players will want to complete this challenge.
Original content by Romain "Zorg" Becquelin.