Rockhopper's Sadness is the penguin manifestation of the emotion of sadness within Rockhopper. Players can obtain her costume at the Inside Out Party. During the party, Rockhopper's five core memories go missing, with one corresponding to each emotion. Rockhopper's core memory for sadness was when he ran out of stinky cheese (which occurred due to the stowaway Blue Border Collie and Orange Tabby Cat Puffles on his ship prior to Puffle Party 2014).