The online requirement was first revealed in the small print of a PlayStation Blog post last week, which confirmed that campaign mode, the livery editor, Scapes photo mode, GT Café and GT Auto will require players to be connected to the PlayStation Network.
In a new interview, Yamauchi told Eurogamer “the requirement for the online connection… is just to prevent cheating overall from people trying to modify the save data, so that’s the reason for the online connection”.
He added: “The online connection is required for the campaign mode. The only part of the game that doesn’t require an online connection is the arcade mode, because that has no effect on the save data, so that’s possible.
“But anything that has to do with the save data requires a connection. For example things like the livery data as well – that’s something that is downloaded from the online server.”
The previous Gran Turismo entry, PS4’s GT Sport, also required an online connection in order to access the majority of its content. However, Sport was positioned primarily as a competitive online game from the start.
“GT7 is both the culmination of the series which answers the expectations of GT fans throughout the years, and at the same time it is a title that marks a beginning of a difficult mission to contain the full breadth of car culture from the past into a single video game,” said Yamauchi.
The title’s campaign mode will return to the roots of the GT Campaign mode experience, Yamauchi said, with players able to “take their own unique journeys and gain life learning experiences” across a world map.
In addition to the return of the GT campaign mode, classic circuits like Trial Mountain and High-Speed Ring will be making a comeback.
Players will also be able to tune their cars in GT Auto and track their car collection in GT Café. “GT7 is clearly designed as a ‘Car Collecting Game’, even more so than the GT series of the past,” Yamauchi said.
“Players will progress and complete missions in the GT Café by acquiring prize cars from various races within the world, as well as from the Brand Central and the Used Car Dealership.”