Some of my mobile games might ask you to create a username so that your high scores can be logged on a global leaderboard not located on your device. This information - your created username and your game score - is transmitted from your device to a remote web server. Other users of the game can view this information on the high scores page of the game. You might change your username by tapping on it and editing.
No other data from the device is transmitted and stored - just the username you create (e.g. "Mikita 222") and your score.
So in other words, be smart and don't enter your name, address, and social security number as your username.
For the support please use: "info (dog) <this site name>.com" with the subject "Privacy: ..."