Dark Souls is a third-person action role-playing game. The core mechanic of the game is exploration. Players are encouraged by the game to proceed with caution, learn from past mistakes, or find alternate areas to explore. Dark Souls takes place in a large and continuous open world environment, connected through a central hub area (Firelink Shrine). Players are able to travel to and from areas and explore various paths, although certain prerequisites have to be met in order to unlock certain areas. Scattered throughout the game world are bosses and creatures of varying types that must be defeated. From almost all enemies killed, the player will receive a relative amount of "souls" which act as both currency and experience points. Some enemies also yield rare items.