But even after half a year of news bites and a trickle of leaked info, you have no idea what you're getting into mechanically. You know it takes place after nuclear war has devastated the world, and you know you're playing as the sole survivor of Vault 111. You've just booted up Fallout 4 for the first time, and as the opening sequence music swells, the thought suddenly hits you: this is your first Fallout game.