Fortnite Challenges will now start on Thursday, and this will be a permanent change for Challenges, with the Week 5 ones now available to unlock. One of these challenges is the "Follow the treasure map found in Greasy Grove", which will give you 10 stars.
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The location of the chest is near Snobby Shores, so you'll want to head west first, and then land on top of the villain base. Hollowpoint has released a handy guide on YouTube to help you find the location more clearly. Check it out below: