Fallout: New Vegas

Obsidian Entertainment's 2010 RPG delivered the most reactive open world ever made in just 18 months of development. Its faction reputation system dynamically changes quest outcomes and character dialogues, offering over 50 unique endings based on player choices. This depth of consequence is 40% more extensive than the average open-world RPG, and it outperforms #9 Minecraft in narrative complexity despite lacking Minecraft's scale. The sharp writing and multiple endings make it the definitive post-apocalyptic RPG, even with its legendary bugginess. Its world feels alive, reacting to every decision you make.