Located deep within the bowels of the earth, this cave system is a hotbed of geological activity. Be careful not to get too close to the Magma Chamber, lest you get caught in a pyroclastic flow of molten rock.
You might also encounter the Rock Monsters, who are known to be quite territorial. They may try to rescue you, but be warned: they're not exactly the most gentle creatures.
For the truly adventurous, there's also the Danger Zone Dash, a thrilling obstacle course that will test your wits and your reflexes. Good luck, you'll need it.