Look for subtle markings or peeling paper icons at the very edges of the world map.
Some fragments are hidden behind the navigation UI elements. GemCraft - Chasing Shadows
The "proper paper" fragments provide a sequence of clicks or a specific coordinate to click on the map background to make the hex appear. Look for subtle markings or peeling paper icons
Look for a blank space on the world map that doesn't fit the grid (usually in the bottom right area). GemCraft - Chasing Shadows
They reveal the location and entrance requirements for the final hidden hex.