Follow this comprehensive guide to drive over all the Whistlestop Summit question mark panels in Mario Kart World.

In addition to basic racing, the newly added Free Roam mode adds an extra layer of fun to Mario Kart World. In this mode, you can freely explore, complete P-Switch missions, activate question mark panels, and more. You need to find five panels located at different places on each track.
Here is a detailed article that contains the exact locations of all Whistlestop Summit question mark panels.
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Locations of All Whistlestop Summit Question Mark Panels in Mario Kart World
First Whistlestop Summit Question Mark Panels

Your reflexes will play a major role in obtaining the first panel, as you need to take a sharp turn to the left immediately after starting from the start line. Next, you will find a ramp on the left side. Continue following the path, and you will find the first panel just after taking the final turn.
Second Whistlestop Summit Question Mark Panel
Once you collect the first panel, jump straight from the ramp to land in front of a green pipe. Use this pipe to pass through it and arrive at the track. Now, head straight, and after a short distance, you will find the second question mark panel at the Yoshi food stand.
Third Whistlestop Summit Question Mark Panel in Mario Kart World
The best way to collect the third Whistlestop Summit question mark panel is to reset the course after collecting the second panel. Afterward, take the approach road to the right and land on a red-colored roof. Once there, you will find the third panel at the first downslope of the roof.
Fourth Whistlestop Summit Question Mark Panel
You can take the speed ramp after collecting the third panel to land on another ramp below the railway bridge. Next, use it to follow the uphill path going to the right. You need to cover a large part of this way to find the fourth panel.
Fifth Whistlestop Summit Question Mark Panel
To collect the final question mark panel, head to the start line and arrive at the uphill path that you took during the discovery of the third panel. Once you start moving up, take the tunnel path to the left. Next, take a right turn, and soon you will drive over the fifth panel.
That was all about Whistlestop Summit question mark panels in Mario Kart World.
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