Mario Kart 73ds -

The ultimate trophies, such as the Gold Glider, require reaching 10,000 coins or interacting with 100 people via StreetPass. Mario Kart Racing Wiki best shortcuts for specific tracks, or are you looking for help unlocking a specific character Mario Kart 7 - How to Unlock Everything (2022)

The standard Grand Prix, Time Trials, and Coin Runners provide plenty of solo content, though the lack of a dedicated "VS Mode" for single players (outside of Grand Prix) was a rare oversight.