To register your product you must have an internet connection. Once the activation code is entered you do not need to be online again to use your Quizzle, nor do you need your original CD in your CDROM drive. However, if not online you cannot view any live links within the programme, nor can you complete the Crossword. All colour change and instructional features, including help pages will be fully functional however. BUT, if you have not registered your Quizzle you can complete the crossword from the CD without an internet connection.