Players can compete against each other in the S1 Grand Prix mode via network connectivity. Players can also race against the best times on the network in a Time Attack mode. The player's own high scores can be uploaded for others to see and race against.
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Sonic Kart 3DX features two different gameplay modes, including:
- S1 Grand Prix (グランプリモード Guranpuri mōdo?): Every Monday at 10am a Grand Prix race was held, with each player's goal being the fastest time. A total of four courses are raced through and the times are automatically uploaded to the online leaderboards.
- Time Attack (タイムアタックモード Taimuatakkumōdo?): This is the basic racing mode, with no limit on play time or course count. The goal here is just to practice getting the best times around the game's tracks.
- (Japanese) (archived)