Shivering Springs

Shivering Springs is a supposed course found in some personalized copies of Super Mario 64. It is described as a snowy level utilizing the unused Cracked Ice and Small Chill Bullies. It can be found by either jumping into one of the inaccessible Cool, Cool Mountain paintings, somehow accessing the Snowman's Land painting behind the mirror, or finding it some other way.

Geography
Shivering Springs is described as a large open area with several Small Chill Bullies, snow-covered trees and freezing water covered by ground-poundable cracked ice. The Small Chill Bullies must be knocked into the freezing water to defeat them. There is also an ice cave similar to the igloo in Snowman's Land that contains a maze.

Missions
"1. SMASHING ICE""2. FREEZE THE BULLIES""3. IN THE CAVE""4. CHILL BULLY CHALLENGE""5. PASS THROUGH THE ICE""6. ABSOLUTE ZERO (Yet to be collected by a player)""7. 100 COIN STAR"

Smashing Ice
In this mission, the player has to break all of the cracked ice in the level, which will cause a star to spawn.

Freeze The Bullies
In this mission, the player has to knock 3 Small Chill Bullies in a group into freezing water, which will spawn a regular Chill Bully, similarly to the "Bully the Bullies" mission in Lethal Lava Land. The Chill Bully must be defeated for this mission's star.

In The Cave
In this mission, the player has to enter the cave and reach the end of the maze for the star.

Chill Bully Challenge
In this mission, some new ice platforms will appear that must be climbed. This will lead to the ice platform from Snowman's Land with a Chill Bully. Knocking it off of the platform will spawn a star. It is believed the name of this mission later inspired Chief Chilly Challenge in Super Mario 64 DS.

Pass Through The Ice
In this mission, the player has to use the Vanish Cap to pass through the ice in the cave and reach an inaccessible room containing the mission's star.

Absolute Zero
It is currently unknown how to collect this star, as nothing has been noted to change about the level in this mission. The name implies it has to do with something very cold.