Dust Cup
From Pixar Cars Wiki
The Dust Cup is a Circuit Cup in Cars 2: The Video Game (DS/3DS). As the name implies, the tracks featured in this cup include lengthy dirt sections that might not be suitable for characters with the blue (2-wheels) ability as they have a much slower speed on dirt.
This is the first cup in the Circuit Cup Mode and the first of the 5 cups available at the start.