"Hiding areas" refers to places where someone or something can conceal or hide themselves, usually to remain unseen or undetected by others. Full definition
An experienced consultant can determine where the moisture may be coming into the building, as well as find both visible and hidden areas of growth. (remonline.com)
Hidden collectible cards can also be found in hidden areas in levels, each one unlocking you a piece of artwork — a nice little addition and something extra for you to work for. (useapotion.com)
You'll miss a lot of the bananas if you don't have a good eye for finding hidden areas. (kotaku.com)