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Swapnote, known as Nintendo Letter Box in PAL regions and Suddenly Exchange Diary in Japan, is a messaging application for the Nintendo 3DS family. Swapnote was released on December 21, 2011, in Japan and December 22, 2011, in Europe, Australia and North America via the Nintendo eShop. It can be downloaded at no additional cost and is pre-installed on newer systems. Swapnote is the successor to the PictoChat app for the Nintendo DS line.