Grand Theft Auto 5

Gaming's biggest blockbuster deserves its place at the head of the list. GTA 5 was already an excellent, brutal, beautiful open-world game, and is made even more so on Xbox One with a visual tidy-up, a glut of new content, and the addition of first-person pedestrian-beating. With the addition of online Heists to make its online component even more enticing, Rockstar edges closer to making a game world so vast and varied that you could start to do away with anything else. Which, come to think of it, was probably the plan all along.