BioShock

A plane goes down in the Atlantic and the lone survivor finds a lighthouse hiding an elevator to Rapture, a city on the ocean floor. A rich man built it so that the gifted could live free of government, church, and rules. By the time you arrive that dream has rotted into civil war, gene-altering drugs, and people who have remade their bodies past recognition. You shoot, you hack, and you bend the city with powers bought from vending machines. Underneath the action sits a real question about free will, and one mid-game reveal reframes every order you have followed without thinking.