To activate a mirrored map in Free Roam, you can warp over to Peach Stadium and follow the track up and jump on to the roof of Peach’s Castle. Enter the iconic stained glass window of Peach and it’ll warp, sending you into a mirrored version of the map. You cannot do this in the pseudo-Free Roam multiplayer lobby.

Nintendo's flagship launch title for the Switch 2 has a lot of very specific requirements for unlocking all of its secrets, including Mirror mode.

There’s an exciting new endurance race that combines several tracks and eliminates drivers after each checkpoint. But it’s a racing world without any oil drips or skid marks.