A separate disc was also released in Japan that included all updates, including Spec III. The latest update, entitled Spec III, added new cars and further improvements to the game and was released in October 2008. Gran Turismo HD Concept also contained an online Time Trial feature. Gran Turismo 4 for the PlayStation 2 was intended to contain an online component, but this feature was pulled before the game's release to avoid further delays a beta of GT4 online was even released. Since Gran Turismo 5's development cycle was so long, GT5 Prologue's servers were online for two years even though the game only served as a prologue.

Up to 16 players can play online at once in GT5 Prologue. Gran Turismo 5 Prologue is the first mass-produced Gran Turismo game to feature online multiplayer. The Spec II update brings Drift Mode (similar to that of Gran Turismo HD Concept), car tuning adjustments, and head to head two-player racing offline. The fourth, called 'cockpit mode', includes the driver's perspective from the interior of the car looking past the steering wheel to the track and is available only for 'premium' cars. Three viewing modes show the car from exterior angles. Any PlayStation 3 - compatible steering wheel works with Gran Turismo 5 Prologue. This function can be mapped to other buttons on the controller if preferred. Players driving with either the control pad or the steering wheel can look left and right in the cockpit of the car by using the D-pad.

It includes functioning speedometers, odometers, reflecting rear-view mirrors, wing mirrors and real-time in-car lighting effects, such as shadows. New to the series is the realistic in-car view feature. According to game developer Polyphony Digital, the NPC's AI has also improved from previous Gran Turismo games. This game introduced the ability to race with up to 16 cars at once to the Gran Turismo series. GT5 gaming area at the 2008 Taipei Game Show

Gt4 ps2 save game download