Scavenger Hunt https://kids.nationalgeographic.com/explorer-academy/article/scavenger-hunt/
Cruz’s Aunt Marisol sends him postcards from around the world with secret messages written in code. Start the scavenger hunt by following the instructions on the first postcard below. See if you can solve Marisol’s codes and unlock a secret about Explorer Academy.
Then follow the link to the next postcard and enter the code you cracked.