In Fortnite (PC, Ps4, Xbox One, iOS) you can also earn a bonus tier for the Battle Pass in week 5. The star is once again hidden in a blockbuster loading screen.
To unlock the required loading screen, you must complete each of the seven weekly challenges. This has only been possible since last night, as one challenge was buggy and could not be completed.
Now you can finally complete this challenge and will be rewarded with a loading screen that shows inconspicuous scenes from the game but also always hides a secret. These secrets come in the form of hints that lead you to a hidden Battle Star.
What do these secret Battle Stars bring? Each hidden star you collect in this way brings you a whole level forward in the Battle Pass. If you have completed all the challenges of the current week and found the secret star, that brings you a total of six levels forward.
You unlock this loading screen when you have completed all weekly challenges of week 5:

Clearly, a battle of good versus evil is underway. The crucial hint is given on the wall of the building. A crab is depicted, and a golden item is hovering above it. This is the Battle Star!
So where is the secret Battle Star now? In Moisty Mire! On the map, there are three wooden animals positioned – a fox, a llama, and a crab. The crab is your target and is located here:

Since the Battle Star is located on the crab, you should land there right at the beginning of a match and grab the star. Afterwards, you can go hunting for loot! If you want to see the exact location in a video, you can do so as well:
Have you completed all challenges yet?