8 Ball Pool is the most played pool game today. Play against players from all over the world in cash games (in-game, of course).
Increase your level by playing. The higher the stakes, the more experience you earn, and the more money too. Just be careful not to lose everything and have to start from scratch!
The game has several types of matches, you can play 1 against 1, or even in tournaments, in different types of matches such as 8 Ball and 9 Ball.