From a design perspective, one of Fallout 3’s biggest hurdles was managing the difficulty curve in an open world. Fallout and Fallout 2 addressed this by placing Vault 13 and Arroyo in the far north while crafting a narrative that relied on unlocking the location of new, more difficult settlements. In terms of structure, these games also benefited from a timer, discouraging players from exploring the vacant wasteland in favor of following the story.
The Rad-Lands 