Play Chess, either single-player (with CPU), or multiplayer via bluetooth.
You can also play Chess, single-player, with CPU. There are three difficulty levels to choose from: Easy, Medium, and Hard. The difficulty of Hard can be both addictive, and helping you improve. It is always a good idea to develop your skills on your own (with CPU), and use them while playing multiplayer with your friends and family!
The chess engine used in the Bluetooth Chess is called BOMG-Stockfish9. This chess engine is a converted version of Stockfish9 (under license GPL3) from C++ into Java.