Draw a line from one safehouse to the other without colliding with anything. Beware the dangers and keep a steady hand! Fame awaits you.
Click on the greenish safehouse to start drawing and then move your cursor to the red one. In addition when a timer is running, you have to do it the given timeframe.
A context menu should be shown when right-clicking or, on touch devices, long-pressing in the game. This menu especially allows to play in full screen and control the volume.