Cookie Monster continues to be the most popular character on Sesame Street in our home, and The Great Cookie Thief . . . A Sesame Street App Starring Cookie Monster ($3) never ceases to entertain them. Cookies are missing, and it is your tot's job to find the thief by reading the interactive story and creating their own wanted posters. The app is filled with great animation and fun uses of the tablet so kids have a variety of options when playing.