A system, method, and graphical user interface for playing games and/or executing applications on a tablet-based client. One embodiment of a graphical user interface (GUI) for playing a video game on a tablet-based client device comprises: a virtual controller rendered on a display of the tablet computer, the virtual controller substantially mimicking the control provided by a thumb stick of a physical game controller and providing omnidirectional, free-form movement in a synchronous direction in which a user moves a finger on the display of the tablet-based client.