Not to be confused with Red/Periwinkle Skin, which formerly represented the United Kingdom.
The United Kingdom Skin is a skin in slither.io. It shows a United Kingdom flag and glows red when you boost. cusk is false for this skin.
But in some browsers, including 2021 versions of Chrome and 2023 versions of Mobile Safari, it appears as though cusk is true on the web.
United States | Russia | Germany | Italy | France | Poland | Rainbow | Sweden | Finland | Denmark | White | Green/Purple | Brazil | Ireland | Romania | ArcadeGo | Block | Yellow/Grey | JackSepticEye | Lithuania | Black/Yellow | Lavender/Indigo/White Star | Light Blue/White Star | Indigo/White Star | Orange/Black | Google | Red/White/Pink | Blue/White/Periwinkle | Kwebbelkop | Golden | PewDiePie | Jelly | Slogoman | Google Play | Red/Periwinkle | Silver | Canada | Switzerland | Moldova | Vietnam | Argentina | Colombia | Iceland | Spain | Blue Gradient | Red Gradient | Yellow Gradient | Orange Gradient | Magenta Gradient | Green Gradient | MasterOv | United Kingdom | Multicoloured Gradient | Bonkers | Red/Black | Blue/Black | FGTeeV |