Shiver City

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 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.

Items Found
In addition to the items listed below, several items can be purchased from Shiver Shop, and 64 Star Pieces can be obtained from Chuck Quizmo here.

Area Tattles

 * This is Shiver City. It's usually completely covered with snow and ice. It's perfect for penguins. It's a bit cold for me. You seem to be fine, though. How do you do it, Mario?
 * It looks like we could go skating on that frozen pond. Skating is tons of fun! I don't know, though... Do you think that ice might break? Oh, you might also notice that gate over there. It leads out into the highlands. The path from that gate leads all the way to Starborn Valley.
 * It's too bad we broke the ice in that pond, huh? Now we can't go skating! What a pity! That gate is the way between the village and the cold hills beyond. A guard is always stationed there. If you follow the path from that gate, eventually you'll come to Starborn Valley.
 * I heard from Goompa that Shiver City is covered with snow all year round.