Gran Turismo 5 Prologue is a precursor and sampling of Gran Turismo 5 and replaced Gran Turismo HD Concept. The "Prologue" suffix is a self-reference to Gran Turismo 4 Prologue, which was released one year before the full version of Gran Turismo 4. Since October 3, 2008, the game is now referred to as Gran Turismo 5 Prologue Spec III which is the software's version 3.0 title. Gran Turismo 5 Prologue Spec III features 16-player online races, over 70 cars (including tuned cars), 6 tracks, 12 layouts, a 60 frames per second frame rate (during races, replays are displayed at 30 frames per second) and LPCM 7.1ch high definition sound.