Cool, Cool Mountain is the fourth world in Super Mario 64 and its remake Super Mario 64 DS with an icy mountain theme. Many of the missions are related to the penguins that live there.
The mission Slip Slidin' Away involves an ice slide. In all the other missions, Mario races a penguin to the bottom to gain a star. Another mission is where Mario has to reunite a lost penguin located at the top of the mountain to its mother at the bottom part of Cool, Cool Mountain.