Tale of Two Wastelands

Tale of Two Wastelands is a mod that seeks to fuse the game worlds of Fallout 3 and Fallout New Vegas into the same game engine, using the latter's game engine to do so. Not only does it allow the player to visit the worlds of both games in full, it even provides a limited amount of continuity as well as free travel between the two wastelands.

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Tropes used in Tale of Two Wastelands include:

• Approval of God: The official Obsidian developers are aware of the mod are admitted being quite impressed with it.
• Canon Welding: To a limited degree. The Lone Wanderer is considered to have become the Courier by the mod, so it assumes the player will start and complete the FO3 world before moving onto the FNV world, complete with slightly re-purposed in-game cutscene assets to provide a "canon" justification for the time skip.
• Obvious Beta: Given these two games were somewhat unpolished themselves, the process of making them work together in combination has resulted in a lot of work for the creators, and even though they have managed to make both worlds and all relevant quests completable in both, they still consider it an alpha release at best for now, given how many remaining issues they still need to resolve.
• Nerf: Some items, perks, and other things required some of these to prevent balance issues, since the game uses the FNV engine as it's base, which had several difference regarding balance to FO3. For instance, super mutants were balanced very differently between the two games, which could make them obscenely hard in FO3.