Free Game of the Day is a free app that highlights a free game each day. You download the game app from within the Free Game of the Day app. This is because many of the apps that they make available are ones that you'd normally have to pay for. It's an interesting marketing model: they convince developers to make their game available for a day for free. This brings attention to their game, and downloads soar, boosting their ranking. In the case of the Stair Dismount game, it went from 5,000 daily downloads to 32,000. Free App of the Day sometimes gives you the full version of a paid game. Other times developers will create a lite version and make that available to Free Game of the Day. The app also has social gaming features built in, including conversations with friends. You can learn more on their website.