— Overview: Gran Turismo 4 Gran Turismo 4 (GT4) is a landmark racing-simulation title developed by Polyphony Digital for PlayStation 2, released in 2004–2005. It’s praised for an enormous car roster, deeply detailed simulation-oriented handling for its era, day/night cycles, lengthy driving missions and single-player content (including GT Mode, arcade races, endurance events, and the famous B-spec mode). Visually and mechanically it defined late-era PS2 realism and remains beloved by sim fans for car selection, track variety, and a simulation-first design.