They reveal the location and entrance requirements for the final hidden hex.

Once you have collected the information from the papers, you must use it to find :

Look for a blank space on the world map that doesn't fit the grid (usually in the bottom right area).

Be prepared; entering the secret levels usually requires a high amount of Shadow Cores . 💡 Tips for Finding Secrets

Your cursor will often change or a tooltip will flicker when hovering over a secret element.