Its primary features are its colorful surface that appear to be made of reflective glass, its uplifting or cheerful music, and is usually the longest (and sometimes the hardest) course (with the exceptions of Super Mario Kart and Mario Kart: Double Dash!!).
SNES Rainbow Road returns in Mario Kart 7, with upgraded visuals, enhanced music, and new gimmicks, and the track waves when the thwomps hit the floor.
N64 Rainbow Road is back in Mario Kart 8, with a large amounts of changes and upgrades, orchestrated music, and an altered layout to incorporate the game's new mechanics, namely the glider and anti-gravity racing. One of the most notable differences is the entire race is one lap with the checkpoint setup instead of the original's six-minute races over the default three laps.
SNES Rainbow Road returns in Mario Kart 8 as DLC, with new graphical upgrade and remastered music.