Shivering Mountains is an icy mountain range, the first level of the Thrillsville world, and the fifth level overall in Wario World. Most of the enemies and obstacles here are ice-themed. Several large Christmas trees highlight the atmosphere, plus plenty of igloos. A common feature of this level is ice slides, which serve to complicate reaching certain areas and obtaining certain collectibles since Wario cannot backtrack up them. The boss of this level is the Winter Windster.
The player begins next to a cottage with a Bunny Spring to help Wario get on top of it, where they will find the red treasure button. Immediately to the right, there is a large ice slide with several ramps. The bottom-most ramp on the back of the slope will help the player get up to the top of the house at the bottom of the ramp, which contains a trapdoor housing the first red diamond of the level. Behind the house are a series of platforms placed around Christmas trees that the player has to use Glue Globes to jump between. On top of the one on the left is a Gold Statue part. Back on the ground, the player can find the red treasure chest's spawn point along with the yellow treasure button to the left of the house. There is a slope here with a couple of a electric barriers that will hurt Wario if he gets too close. Afterward, there is a Garlic Dispenser before a large slope with many Sled Creatures sliding down it and a few igloos. On top of one of the igloos is the red Spriteling. To the right of the slope is an Angler Mangler, waiting for and blocking Wario. After this is another ice slide that leads to either an icy cavern below or a snowy area above, the latter of which the player has to jump off the correct ramp to reach. Another one of the ramps toward the start of the slide in the back has a Gold Statue part on it.
If Wario makes it to the snowy area, he will be immediately thrust into a battle with a yellow Crystal Entity. Other enemies in the area include Polar Bears, Snow Bombers, and an enemy generator. There are two igloos here, one of which has the blue treasure button on top of it. Behind them are several Christmas tree platforms, one of which has a wooden chest underneath it. The yellow treasure's spawn point is below the tree on the far right. Jumping through the platforms will ultimately lead to a trapdoor, with a Gold Statue part on the way. The sub-level beneath the trapdoor contains the yellow Spriteling. Once the player feels like they are done in this area, they can break a block that leads down to the icy cavern, right into the first Battle Ring.
Regardless of how the cave is entered, in order to progress through it, the player must first pass through a Battle Ring. Past this are several Icicle Mites the player can use to get over the walls. On the eastern platform is a steel trapdoor near an enemy generator. To the left of this platform is where the blue treasure spawns. To the right are a couple of poles which are placed to help the player reach the purple treasure button. Afterward are a number of bridges, with several of them having Turtles and electric barriers that impede Wario's path. To the right of the second Turtle is a steel trapdoor, and below that and to the left is a wooden trapdoor. The green Spriteling is beneath the steel trapdoor, while the wooden one contains a Gold Statue part. The bridge leading to the left of a statue leads to where the green treasure will spawn, along with the chartreuse treasure button on the wall across from the bridge that the player needs to throw an enemy into or jump and hit it to activate it. After the bridges is a tall platform where the blue Spriteling is; Wario needs to use an Icicle Mite to reach it. Nearby is an enemy generator and the green treasure button high up on the wall. To the right are more narrow bridges where Fattingtons will spawn and attempt to bounce Wario into the abyss below. On a wall at the back of this section is the cyan treasure button, while the chartreuse treasure is on a platform in the middle of the narrow pathways. There is a pathway in the back leading to the left guarded by a Fattington that leads to a Bunny Spring, which allows Wario to access an isolated above ground area with a few assorted enemies, the pink treasure button, the cyan treasure, and a Gold Statue part. The path to the right of that one leads to an Ice Ankiron, a steel trapdoor containing another Gold Statue part, and the exit of the ice cave.
Ahead is an upward slope with a few Fattingtons dropping in from above leading to a second Battle Ring, with a trapdoor housing a Gold Statue part on the way. After the Battle Ring is another fight with an Angler Mangler. To the right, there is a slope with several Freeze Cannons and Sled Creatures. Above and slightly to the right of the first Freeze Cannon in this area is a wooden chest, and near the end of it is the purple treasure's spawn point. After this is the final ice slide of the level. A ramp on the slide toward the front has a Gold Statue part on it. At the bottom of the slide is a Garlic Dispenser, ByeBye Balloons, and the pink treasure's spawn point. A pair of Glue Globes can be used to climb to the ledge above, where the player will find some Snow Bombers, an enemy generator, a steel trapdoor where the purple Spriteling awaits, and the goal.
If Wario reenters the level after defeating the boss, there will be a set of ByeBye Balloons at the beginning that will take him to the where the Turtles are.
Red diamond sub-levels
Gold Statue parts
Shivering Mountains has two background music tracks. One plays during the above ground sections of the level, while the other plays in the ice cave.
Names in other languages