Doodle can be used with or without a data connection. However, the app only synchronises with the Parent and Teacher Dashboards (and other devices) when it has a connection. If there is no connection, the app will store progress locally in the device and synchronise when the connection is regained.
If using Doodle offline, it is important to keep using the same device. Then when you have internet connection again, login on the same device to ensure the work syncs to our database and then to the Parent and Teacher Dashboards.