How to unlock Rainbow Road in Mario Kart World
Briefly

Rainbow Road is the standout track in Mario Kart World, known for its vibrant colors and unique challenge. To access it, players must first unlock the Special Cup by finishing all previous courses, regardless of placement. After racing it once, players can replay it through Grand Prix or VS Race modes. Additionally, there’s a chance to race it in online play; players can vote for it from three options or choose ‘random’ to potentially include it in the track selections during multiplayer.
The Rainbow Road becomes available only after you have unlocked the Special Cup in the Grand Prix mode.
It doesn't matter what CC you play the cup on, and it doesn't matter if you even place in the race.
You can enjoy this track by replaying the Special Cup in the Grand Prix mode or selecting it in VS Race mode.
If you are really burning to race Rainbow Road in an online lobby, your best bet is to vote 'random'.
Read at Polygon
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