Eurogamer: Gran Turismo PSP has been in development for a really long time. Can you explain what stretched development out and how the game has changed over that time period?
Kazunori Yamauchi: We first made the announcement in E3 of 2004, so [laughs] it's been five years. Since then we've released GT4, Tourist Trophy, GTHD and GT5 Prologue. Of course we were always working on the PSP version a little bit at a time, but every time we have one of those releases it's affected by that new title. So this is a software that was born in between GT5 Prologue and GT5, and it's affected by both of those titles.
Eurogamer: In return, does it have any kind of knock-on effect on how GT5 is coming along?
Kazunori Yamauchi: I don't think there was a direct effect, but I do believe that the development team really gained experience in streamlining displaying graphics on a very small space and also how to manage memory when the amount of memory available is very small. That sort of experience is something that was gained by the team.
And you know, this is the first time we've developed a portable game, and I think there is an effect on how we see games, and how we understand videogames.