The goal of the Police Station mini-game is to connect all the stations to their corresponding emergency before time runs out.
You can draw paths by sliding from the color points with your finger. Paths can't overlap and will be cut if drawn over. You can tap the "Undo" button to clear the board if you want to start over.
If you run out of time, you can pay Diamonds for extra time. Or you can exit the game and try again.