3. Online Play
Something that was both praised and criticised upon its addition to GTA4, online play added countless extra hours onto a game that was hardly lacking in content in the first place, allowing players from around the world to compete in everything from street races to straight-up deathmatches. Most enjoyable were the specialised modes, such as co-operative missions, or my personal favourite, Cops and Crooks, which serves as a virtual equivalent to childhood playground game Cops and Robbers.