8 Ball Pool

8 Ball Pool is one of the games that managed to survive almost unchanged over the years, no matter the platform that was used. As you can expect, it's also available for Android devices and has millions of players.
The game has it all and players can either try simple 1-vs-1 matches or enter tournaments to win trophies and exclusive cues. It's possible to customize the tables and to challenge your friends.
Or course, there is a level up system in the game that keeps everything interesting, and that makes sure that people are being paired correctly.