Organized online events are held on a regular basis within the game's Sport Mode, which also features daily online races that are not part of official FIA championships, as well as third-party championships such as the Toyota Gazoo Racing GT Cup (formerly the GR Supra GT Cup). The Nations Cup and the Manufacturers Series featured 'live' components similar to the regional finals held in the GT Academy competition, dubbed Gran Turismo World Tour, which are streamed in-game on Gran Turismo LIVE feature as well on Gran Turismo TV YouTube channel and PlayStation's Twitch channel. The winners of the championships are honored at the FIA's annual prize-giving ceremony in Paris, France. The FIA managed the series directly as they would with any of their other race series. With support and certification of the FIA, the central aspect of the game is the FIA-Certified Gran Turismo Championships, consisting of two championships held simultaneously throughout the year: the Nations Cup, where players represented country, and the Manufacturers Series, where players represent their favorite car manufacturer. The TAG Heuer partnership expired in early 2020, with TAG Heuer branding and the museum being removed from most areas of the game, except for Livery Editor decals and trackside sponsorship. Additionally, TAG Heuer is integrated into the 'museum' section of Gran Turismo Sport, showcasing the history of the Swiss watch maker. TAG Heuer serves as the timekeeper and watch brand for Gran Turismo Sport, where its 'Live Timing Technology' is utilized to measure all in-game time. Polyphony Digital and TAG Heuer announced a partnership for the game. However, it was announced later that VR support would be limited to a special 'VR Tour' Mode. The experience while playing was described by series creator Kazunori Yamauchi as 'very good and very natural'. Gran Turismo Sport was originally announced to be fully compatible with Sony's virtual reality headset, PlayStation VR. For the first time in the series, the game features Porsche vehicles, after Electronic Arts had lost their exclusive licensing rights to the Porsche brand (previous Gran Turismo games only included RUF as a substitute). However, players still have the option to modify the race's time of day before entering the race.

Unlike Gran Turismo 5 and Gran Turismo 6, the game does not feature a dynamic weather system and day-night cycle.

It has been described as different from the 'Prologue' titles released in the past and features more content. Online racing is also featured in the game.

Gran Turismo Sport includes two game modes: 'Sports Mode', 'Arcade Mode' and more.

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