Ori and the Blind Forest: Definitive Edition

When at the map screen, the total % under each area's name is how much of the map you have uncovered. All collectibles and some secret areas (refer to "No stone unturned") count toward this percentage (whereas in the regular version they do not), so don't get confused and not return to an area that shows 100% if you're still missing some secrets or collectibles later in the game.