Rosalina's Ice World is the second race course in the Special Cup of Mario Kart 7 and takes place on an icy road owned by Rosalina and based on the Super Mario Galaxy installments. The drivers can dive in water, where some Penguins swim, which strongly resembles the main planet of Cosmic Cove Galaxy.
A good course, but not great. I've never tried it online but maybe in sometime. Maybe it's because of it's difficulty that's moved it to the Special Cup. What do you think?