What took Polyphony Digital so long to release Gran Turismo on the PSP? - Quora

Do Sony and Microsoft make their own games? - Quora

Why are Gran Turismo 7 Fans Outraged? What did Polyphony Digital do to calm the Gran Turismo 7 fans down? - Quora

Why are video games for the new gen consoles $10 more expensive than how expensive those of the previous gen consoles were when they first came out seven years ago? - Quora

What took Polyphony Digital so long to release Gran Turismo on the PSP? - Quora

Why exactly do some old video games go up in price and cost more than they originally did? - Quora

What took Polyphony Digital so long to release Gran Turismo on the PSP? - Quora

Why are old video games so expensive? - Quora

Why is Sony slowly rolling out the release of 'Gran Turismo' instead of promoting it with movie stars? - Quora

Gran Turismo PSP — Your Questions Answered – PlayStation.Blog