The Blockbuster Challenge in Week 4 of Fortnite Battle Royal gives you a free battle star that you can pick up after you completed 4 weekly challenge sheets. After completing these challenges, you get rewarded a new loading screen that shows the rocket base with a battle star pocking out in the back.
To find this rocket base, travel to the far west of the map and climb a mountain east of snobby shores. The free battle star for week 4 is hidden directly on one of the arms that holds the rocket in place.
Season 4 Challenges
Fortnite | WEEK 8 Battle Star Location (Search Between a Bear, Crater, and a Refrigerator Shipment)
All 7 Secret BATTLE STAR Locations | Fortnite (All Blockbluster Stars + Loading Screen Challenges)
Secret Battle Star Location WEEK 7 | Fortnite (NEW Blockbuster Outfit - Blockbuster Loading Screen)
Fortnite | Finding ALL Soccer Pitch Locations WEEK 7 (Score 5 Goals in Different Pitches)
Fortnite | Best Mushroom Locations WEEK 7 (Finding Mushroom Filled Areas | Week 7 Challenges)
Fortnite | Battle Star Location WEEK 7 "Follow the Treasure Map in Pleasant Park" (Week 7 Challenge)
NEW Secret Battle Star WEEK 6 Update 4.4 | Fortnite (Blockbuster Challenge / NEW TRUCK LOCATION)
Score GOALS in 3 different PITCH locations WEEK 7 | Fortnite (NEW Soccer Stadium / Pitch locations)
How to Find Foraged Items WEEK 7 Challenges | Fortnite (Apples, Mushrooms & Hop Rock Locations)