The Blockbuster Challenge for Week 3 in Fortnite Battle Royal gives you access to a free battle star that you can collect at a secret location on the map.
This Blockbuster Battle Star only unlocks after you completed 3 full challenge sheets. Once all the challenges are done, you are rewarded with a new loading screen that gives you a hint at the secret free battle star. You can find the Blockbuster Week 3 reward on top of a hill west of fatal fields.
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