World 4 (Paper Mario: Sticker Star)
From the Super Mario Wiki
World 4 is the fourth world in Paper Mario: Sticker Star, located west of the Decal Channel. It is an ice and snow based world, with several icy peaks as well. Before this world can be accessed, the first three worlds must be cleared. It and the other two worlds may only be accessed by using the ship at Surfshine Harbor. Unique enemies include Snow Spikes and Ice Bros. Shiny enemies, such as Shiny Goombas and Shiny Koopa Troopas, are also first encountered here. The boss of this world is Mizzter Blizzard, disguised as the Bowser Snow Statue; he is faced at Bowser's Snow Fort.