Chrome 42+ disables NPAPI plugins like Unity3d plugin.
Copy and paste the following text into your browser: chrome://flags/#enable-npapi and enable the NPAPI plugin.
Or try another browser like Firefox
Have you ever ever want to drive a subway? In Metro Rail Simulator you are the one that drives through the tunnels and transport people. Use the arrow keys to drive/brake and use the Q and E keys to open and close the doors.