Sep 19, 2012 - Smileypop introduces Charaku 1.0 for iOS, the new way to play Sudoku. No numbers, just cute characters. Instead of typing or tapping, users drag and drop the different funny faces into place. For the countless Sudoku fans out there, they'll enjoy a more visually appealing way to play their favorite puzzle game. For everyone else, the unique gameplay mechanics will have them flexing their fingers and their brain as they solve each increasingly difficult challenge.