Dungeon crawling is a term used almost exclusively in RPG games that refers to the act of going through a dungeon. These are areas that are not towns where you rest, sleep at the inn or buy things from NPCs. They are not the overworld where you fight medium level wild animals. They are dungeons, where the real challenge lies. Dungeon crawling is the act of going through these dungeons, fighting your way through, to finally make it to the end. A well known dungeon crawling genre is the Roguelike.