scores.fiba3x3.com is an Internet-cloud based web application that connects what is happening on the event venue scoring systems to the global FIBA 3x3 database, enabling automatic feeding of results to the schedules and, for example, live scoring widgets.
Hence, if you plan to use it, you should make sure you have good Internet connection in place.
You will need the Internet connection, for example, to download the up-to-date game directory. However, when the games are on, the web app is designed to be "offline tolerant". This means that the web app continues to work normally, even if the Internet connectivity goes off for some time during the game. In that situation, the app stores all the game actions to the computer's local database and sends them to the Cloud when the connections is restored. Naturally, the live scoring widget is not updated when the Internet connectivity is not working.