Fortbyte number 18 of the decryption challenge is waiting for you between Mega Mall and Dusty Divot. More precisely, it is located in the small shed just next to the entrance of the slipstream, behind a box.
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The challenges and Fortbyte locations of the Fortnite Season 9 decryption challenge, as well as the complete list of Fortbytes, are to be found in this article.
