Once you've mastered Mario Kart World's multitude of cup circuits, you may want a new challenge. Mirror mode literally flips maps to change the experience.

Spotted by IGN, an account on X called Ninjinaut showcased the Mirror Mode Easter egg in Free Roam for Mario Kart World. The video sees Baby Rosalina jumping into the window, which is a direct callback to Super Mario 64's mechanic for accessing new worlds.

Remember warping through the paintings in Princess Peach's Castle, back in Super Mario 64? Well, you can use a similar method to access Mario Kart World's Mirror Mode in Free Roam, if you drive over and scale the same royal residence's roof.