Flappy UST is a free Android game developed by Nicergames. It falls under the Games category and is dedicated to Rubius fans. The game revolves around making UST fly by tapping the screen and avoiding obstacles.

The game is simple to play, and the controls are easy to understand. The graphics are decent, and the sound effects are enjoyable. One of the game's unique features is the ability to connect with Google Play Games and share your high scores with your friends. If you're a Rubius fan, this game is a perfect fit for you.

Overall, Flappy UST is a fun game that provides a great way to pass the time. It's free, easy to play, and perfect for Rubius fans. The only downside is the occasional ad, but it doesn't interfere with the gameplay.