Shiver City is a cold and icy city found during the events of Paper Mario. Many Bumpties live in this city. Mario and his partners travel here at the beginning of Chapter 7 and must solve a murder mystery before they can go on. Mario can also get an Ultra Shroom and four regular Mushrooms by sleeping at the Toad House after gaining access to the Crystal Palace. Every time he sleeps there, Mario receives an Iced Potato, an item used in many recipes. Beyond the city is Shiver Snowfield. Shiver City is later referenced by one of the Bumpties in Poshley Heights during Paper Mario: The Thousand-Year Door.
After Mario and his partners clear Chapter 6 in Paper Mario, they are told by a Ninji at Merlon's house in Toad Town to go to Starborn Valley. Merlon mentions that there is a pipe below Toad Town that links to Shiver City, which Starborn Valley is located near. When Mario and his partners go through Toad Town Tunnels, they arrive at a place where Mario must do Tornado Jumps to reveal some Hidden Blocks. With the help of these blocks, they are able to reach the blue door to a frozen pipe, which leads to Shiver City.
Upon first arrival, Mario and his partners are told by the guard of the east gate that they can't pass without the mayor's approval. When they head to the mayor's house, however, they find the mayor unconscious on the ground, supposedly dead. Mario is soon accused of murder by the Penguin Patrol, who gives Mario a chance to prove his innocence by finding the real "murder", forbidden to leave the city (even to go back to Toad Town Tunnels) before he does. Mario breaks the frozen pond in the village with the Tornado Jump and gets the Warehouse Key with Sushie's help, and uses it to open the door to the storehouse. After getting to the roof, he jumps to the roof of the house to the west and gets into Herringway's house. When Herringway and he go to the mayor's house to further investigate, however, the supposedly-dead mayor lives again, revealing that it was not a murder. Mario is then free to go.
When Mario receives the Scarf from Merle, he is told to get the Bucket from the mayor, and comes back to the city to do this. With the two items, Mario and his partners will be able to proceed further to Shiver Mountain.
Sidequests in this area include getting the Star Pieces near the mayor's house as well as from the mayor for letter delivery. The city is divided in three scenes, with the mayor's house being the westernmost one in the western scene. There are another two houses in the western scene, in the eastern one of which lives a food-loving Bumpty. Mario can use this house to get to the western one for the Attack FX E badge in it. The scene in the middle contains the pipe to/from Toad Town Tunnels, as well as an ordinary Bumpty's house, the Shiver Shop, and a Toad House. If Mario sleeps for the first time in the Toad House after helping the snowmen, he will find an Ultra Shroom surrounded by four Mushrooms on the inn ground as well as an Iced Potato on the table the next morning, with the Toad unsure where they are from. Subsequent nights spend in the Toad House only witness one Iced Potato each time. Herringway's house and the store house are in the eastern scene, and so is the gate to the Shiver Region. The Bumpties in the village will often sneak into Herringway's house to read his unfinished novel, much to his annoyance.
At the end of the game, the explorer Kolorado with two assistants can be seen in Shiver City, heading for Shiver Mountain under the assistance of Kooper. Mail carrier Parakarry comes and delivers an invitation letter to Kooper from Princess Peach, and Kolorado lets Kooper go. Parakarry also brings a message to Kolorado from Kolorado's Wife, which scolds him for not returning home often. Upon hearing this, Kolorado abandons his plan and the two assistants, heading back home.
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