Nuka-World 's main gameplay consists of both questing and exploration. The player controls the protagonist during their journey through Nuka-World, a former amusement park, now run by groups of raiders. As with Fallout 4, Nuka-World can be played in both first-person and third-person perspectives. It is set in the eponymous fictional amusement park Nuka-World. It was developed by Bethesda Game Studios, published by Bethesda Softworks, and released on August 30, 2016, for Microsoft Windows, PlayStation 4 and Xbox One. When looking at various records left around the work, these raiders are divided into at least several different groups, which often fight each other for territory and resources.Fallout 4: Nuka-World is an expansion pack for the 2015 post-apocalyptic action role-playing video game Fallout 4. In addition, the raiders in Fallout 4 are not a single faction in lore, but are actually several different groups that are all classified as raiders. Based on this, it stands to reason that the in universe civilian populations are likely greater than the raider groups. Also, in order for a group to subsist themselves off of raiding and stealing from other groups, they generally would need a larger population of civilians to extract surplus resources from. If you compare the size of Diamond City in game to the size of the actual Fenway Park, Diamond City could potentially be home to thousands of people in the Fallout Universe. In all likelihood, the in universe civilian populations are likely significantly larger than they appear in game. For instance, the NCR has a canonical population of over 700,000, but you don't see nearly that many people in Fallout 2 and New Vegas. The civilian population of various settlements is likely scaled down to gameplay dynamics. The in-game numbers may not match the canonical populations. However this can only be done because the Legion's camp is beyond the normal game map, you can only get there via loading screen. If you can find a spot to look past the walls the encampment clearly continues on far past what you are allowed to explore. Some of the old design is still visible at the Legion Fort in NV. On the other hand raider camps tend to be large and fully populated to give the player plenty to shoot and loot. Every npc that just pads out the town population, and every farmhouse that is just there to set the scene is effectively wasted data. In the more modern Fallout games, since the world map is the gameplay map things that could normally be glossed over had to be explorable, but since a map that was realistically large would be both boring and excessively huge, towns that are supposed to be large are just a handful of buildings and npcs.
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By doing this they can easily say that a town is large even if you only interact with a small section of it. Even when you did enter town, it would often only show a section, such as the marketplace or "downtown" and have the edges of the map have things such as farm fields or roads that obviously continue on past what you can see.
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In the isometric Fallout games not every area was "fully explorable", you travelled around on the world map and zoomed in when you had an encounter/entered town/found some other point of interest. I'm going to expand on that for those who are unaware. Natural consequences of the transition to 3D