The Fortbyte number 12 of the decryption challenge is found on condition that the Nana Nana Spray is used inside a molten tunnel. Find its location with this guide.
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To find Fortbyte number 12 of the decryption challenge, make sure you have the Nana Nana Spray (step 57 of the battle pass, paid version).
Then go to the foot of the volcano and follow the lava flow until it rushes into the molten tunnel that used to lead to Tomato Town. The Fortbyte is waiting for you at the end of the tunnel.
Written by Augustin "TheGreatReview" Héliot. Translated from French by Millenium.us.org
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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.