It’s an endless game and you can keep playing unless the rolling ball collides with the cactus or other obstacles. Go as far as you can and try scoring maximum.
Compare you score with your friends and top players worldwide through Google Leader board. To compare your score you need to sign in using your Google Gmail id.
It’s an addictive game. Playing it 1st few times, you’ll find it extremely hard unless you get used to the game. So play as much as you can to get your high score growing.