Fortnite Chapter 2 has opened a totally new guide, giving it new places and difficulties. One of the present difficulties requires the accompanying from you:
Search covered up ‘O’ found in the Open Water Loading Screen – Fortnite Chapter 2 Open Water
Hidden O found in the Open Water Loading Screen Location
You unlock the loading screen of open waters after completing 8 of the challenges. When you have completed 8 challenges, you will also get the challenge to find this hidden letter. You will find the hidden “O” in Graggy Cliffs, next to the house which can be found right by the sea.
This challenge counts towards the “Alter Ego” challenge “Collect F-O-R-T-N-I-T-E Letters Hidden in Loading Screens” which unlocks the mystery skin for this season when you collect them all.