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Fallout 3 Walkthrough: Main Quest Route, Side Quests, and Endings

A spoiler-light route through Fallout 3’s main quest, plus the essential edition and Broken Steel details to know before reaching the finale.
Length4 min Posted Quest giverVGSources Team
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For the standard main-story route, leave Vault 101, investigate Megaton, follow the trail through Galaxy News Radio and Rivet City, then continue toward Vault 112. Side quests are optional. Before the final mission, check whether you have Broken Steel: without it, the main quest ends the game session, while the add-on continues the campaign after Take it Back!.

Before you start: check your edition and add-ons

Fallout 3 has a definitive ending when its main quest ends, Bethesda Support says. Without Broken Steel, Bethesda says you must load an earlier save or start a new game to return to the outside world. If you want to keep exploring after the original finale, make sure Broken Steel is installed before completing the final quest. Bethesda Support: ending behavior

Broken Steel is a continuation of the original main quest, not just postgame scenery. Its quests begin after Take it Back!, and it raises the level cap from 20 to 30, according to Bethesda Support. Bethesda Support: Broken Steel

The documented Game of the Year edition for PC, PlayStation 3, and Xbox 360 includes the base game and all five add-ons. That is a historical release detail, not a guarantee of current availability or compatibility on newer hardware. Check your platform, edition, and installed add-ons before following DLC-specific instructions. On PC, Bethesda says to enable add-ons in the game’s Data Files menu; the installation process can differ by store and setup. Game of the Year edition details · Bethesda Support: Steam DLC

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The main quest walkthrough

This is the familiar main-story route, not a list of every possible way to reach each objective. Exploration can open alternate paths, and the quest sequence is flexible enough that not every player will complete each stage in precisely the same order. Fallout 3 quest route and categories

1. Escape Vault 101

Begin with Escape!, the opening quest that takes you out of Vault 101 and into the Capital Wasteland. Once outside, Megaton is the natural first destination for picking up the main-story trail.

Rank #2

2. Investigate Megaton and follow the lead

In Megaton, pursue Following in His Footsteps. It points you toward Galaxy News Radio and establishes the next leg of the main quest. Quest reference: Following in His Footsteps

3. Continue through Galaxy News Radio

Follow the Galaxy News Radio lead as the standard route toward the next main-story developments. The quest route can be bypassed in some circumstances, so treat this as the reliable conventional path rather than an absolute requirement for every playthrough. Quest route reference

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Fallout 3: Game of the Year Edition - Classic (Xbox 360) [UK IMPORT]
  • Includes Fallout 3 and 5 expansion packs: Operation: Anchorage, The Pitt, Broken Steel, Point Lookout and Mothership Zeta.
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4. Go to Rivet City and pursue Scientific Pursuits

The route continues to Rivet City, where Scientific Pursuits directs you toward Project Purity and Vault 112. If you have discovered locations or advanced objectives while exploring, your quest stages may not match this sequence exactly. Quest reference: Scientific Pursuits

5. Enter Vault 112 and complete Tranquility Lane

Continue into Vault 112 and undertake Tranquility Lane. Entering Vault 112 can advance past earlier quest stages, so follow the active quest objective if your journal reflects a different order. The quest references support this route, but do not establish every encounter or solution detail; this guide therefore stays focused on the progression rather than prescribing unverified choices or puzzle steps.

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Fallout 3: Game of the Year Edition
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Are side quests required?

No. Side quests provide optional stories and activities alongside the main quest; they are not prerequisites for following the main route. One early option is The Wasteland Survival Guide, offered by Moira Brown in Megaton. Take it if you want an exploration-focused detour, or leave it for later if you are concentrating on the main story. Quest list and categories

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Does Fallout 3 end after the main story?

In the original game without Broken Steel, yes: Bethesda says the main quest has a definitive ending, and returning to the outside world requires loading an earlier save or starting a new game. If you plan to finish optional quests after the original finale, do them beforehand or install Broken Steel. With the add-on installed, the campaign continues after Take it Back!. Bethesda Support: ending behavior · Bethesda Support: Broken Steel

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Best Value
Fallout 3
  • Fight for survival against terrors of the outside world, radiation, and mutants after nuclear fallout
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Choosing a route: story first or broad exploration

Approach What to do Best fit
Main-story focus Follow the route from Vault 101 through Megaton, Galaxy News Radio, Rivet City, and Vault 112; complete side content before the finale if you do not have Broken Steel. Players who want to reach the story’s ending with fewer detours.
Exploration and side quests Take optional quests such as The Wasteland Survival Guide while progressing, and check the installed add-ons before planning post-finale play. Players who want optional content woven into the journey.

There is no single add-on order established here beyond Broken Steel‘s post-finale dependency. Avoid assuming that the other add-ons must be played at a particular point in the main quest.

Manuals and older guides

Bethesda provides a link to the digital PC manual and says it cannot provide physical copies. Bethesda manual help

The Prima Fallout 3 Official Game Guide is a historical supplementary reference with maps, strategies, and walkthroughs, but the source describing it also reports errors. Treat it as a reference rather than an infallible authority. Guide description and reported errors

Quick Recap

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