Sandbox RPG or Open World RPG allows the player a large amount of freedom and usually contain a somewhat more open free-roaming (meaning the player is not confined to a single path restricted by rocks or fences etc.) world.
Sandbox RPGs contain similarities to other sandbox games such as the Grand Theft Auto series, with a large number of interactable non-player characters, large amount of content and typically some of the largest worlds to explore and longest playtimes of all RPG due to an impressive amount of secondary content not critical to the game’s main storyline. Sandbox RPG often attempt to emulate an entire region of their setting.
Popular examples of this subgenre include the Dragon Slayer series by Nihon Falcom, the early Dragon Quest games by Chunsoft, Zelda II by Nintendo, Wasteland by Interplay Entertainment, the SaGa and Mana series by Squaresoft, System Shock 2 by Irrational Games and Looking Glass Studios, Deus Ex by Ion Storm, The Elder Scrolls and Fallout series by Bethesda Softworks and Interplay Entertainment, Fable by Lionhead Studios, the Gothic series by Piranha Bytes, and the Xenoblade Chronicles series by Monolith Soft.