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The kiosk demo of Mario Kart 8 Deluxe is found on Nintendo Switch demo kiosk units, typically found in retail stores. A Chinese version of the Kiosk Demo also exists as well as a Wave 6 DLC one, containing DLC tracks as playable tracks (randomly selected).
Only 9 Race Courses and 4 Battle Courses from the full game are playable in the demo, and are selected at random upon confirming your vehicle combination.
Race Courses
Wii Wario's Gold Mine
Wild Woods
Super Bell Subway
Hyrule Circuit
Dragon Driftway
Big Blue
Animal Crossing (Summer)
GBA Ribbon Road
3DS Neo Bowser City
After the trophy screen is dismissed, a "Thanks for Playing!" screen will appear. After a few seconds pass, or when the A button is pressed, the system boots back into the Nintendo Switch demo kiosk menu.
Files
To do: If possible, look into the demo files and determine what things from the final are and aren't present.
Most unavailable features are still present in the game's files, namely online & wireless play functionality and the absent vehicle parts and characters, though the excluded courses and their respective music are not.