When playing via With Friends or Others Nearby, one player will create a room that other players can join, and the rules of the race are set by the room creator.
The room creator may set the following rules:
・Teams: No Teams / 2 Teams / 3 Teams / 4 Teams / Team Attack (items can hit teammates)
・Speed: 50cc / 100cc / 150cc
・Item Slots: Default / 1 / 2
・COM Racers: Yes / No
・Number of races: 3 Races / 6 Races / 12 Races
・Join Method: Anyone / Room Code
・If the COM Racers rule is enabled, then the game will fill any empty driver slots with computer-controlled drivers until the race has 8 players. If the race has 8 human players, then no COM racers will be added.
・Courses from the cups available in the current tour may be chosen.