A method of playing video using a handheld display device having a touch-sensitive screen and a transceiver for sending and receiving digital information. The method comprises the steps of: imaging an area of a printed substrate and generating image data using an optical sensor, the printed substrate containing printed content associated with a video; determining interaction data using the image data, the interaction data identifying a substrate identity; retrieving video data associated with the printed content; and playing, on the touch-sensitive screen, the video based on the retrieved video data.