Mario Kart Throwback is a game in the Mario Kart series that only contains retro courses. It is part of the Nintendo Throwback series. Unlike other games in the Nintendo Throwback series. This game does not feature separate games. However, instead separate grand prixs. The game uses the Mario Kart 8 engine. However, antigravity, underwater and hangliding is not present. With that being said, the only parts of your kart that can be customized is it's wheels and base.