Subway Simulator 9 - Paris Edition is a realistic simulation game that lets you explore the city from under the ground. The game is about traveling through miles and miles of intricate tunnels, high speed, and punctuality. As soon as you arrive at a station, use the door button to make the doors open. Wait for the passengers to take their seats then use the door button again to close the doors.
You need to adjust the appropriate speed according to the signs. If you speed up too much, you will get a ticket. In the upper right corner there's a passenger counter. You need to take as many passengers as you can to gain the highest score. Don't forget to be punctual and don't miss a single station.