10 questions · hard · Trivia quiz · Fallout
One vault, one father, one purifier. Fallout 3 rebuilt the series in first person around a single question: what Project Purity is worth. The Lone Wanderer leaves a vault designed never to open, crosses the Capital Wasteland after a father who restarted his life's work, and finds the Enclave waiting under a president who is not what he claims. Every question is answerable from the 2008 game and its record: no expansions required beyond one famous change to the ending, and the Enclave's leadership is kept straight between games, which is more than the Enclave manages.