This game is provided with two different options to choose one car or two cars to play the game.
In first option (i.e. to choose one car), the player has to control only one car while avoiding traffic and hence increasing the score. The speed of the car increases with time.
In second option (i.e. to choose two cars), the player has to control both the cars simultaneously while avoiding traffic for both the cars. And the speed of both the cars increases with time, and so as the score.