Grumble Volcano as seen in Mario Kart Wii
Grumble Volcano is the last course in the Star Cup of Mario Kart Wii. It takes place in a volcanic area with lava over the place. Drivers will have to jump over gaps in the track with lava beneath using the ramps. From the second lap onward, parts of the track collapse and new gaps appear on the course. At the beginning of the track is a cave, followed by octagon platforms which move left and right. At several places, the track splits into a right and a left path, both of which drivers can take. Flame Bursts and Podoboos appear as obstacles. Giant ? Blocks appear in the background scenery.
This area is said to be based around the Melty Molten Galaxy from Super Mario Galaxy, World 8 from New Super Mario Bros. and possibly Dark Land from Super Mario Bros. 3.
At the beginning of the race, you can go on top of the rock to the left with a mushroom and circle it three times, instead of doing the whole course.