Elder Scrolls V: Skyrim

The Elder Scrolls V: Skyrim is a defining open-world action RPG from Bethesda Game Studios. It offers unparalleled freedom, allowing players to explore the frigid province of Skyrim at their own pace, tackling the main dragon-born prophecy or countless side activities like guild quests, crafting, and exploration. Its first-person combat, skill-based progression system, and dense world filled with dungeons and lore created a cultural phenomenon. The game's longevity is massively extended by an active modding community.

It ranks highly for its sheer scale, immersive world-building, and the sheer amount of content. It's a paid title, famously re-released in multiple editions across generations of hardware.