This app is one of the games for participants in the TEDS 21 study. Please see your invitation for details, or look at our website: http://www.teds.ac.uk For most of the study activities, you will need the main TEDS21 app to be installed, too. If you don't have it already, you can find it here: https://itunes.apple.com/us/app/teds-21-study/id1100146862?l=it&ls=1&mt=8 If you would prefer to use a desktop or laptop computer, you can participate using the web version instead here: https://app.studies.teds.ac.uk
