Is the navigation controller required for all PlayStation Move games? What purpose does it serve?
No, the navigation controller is not required for all PlayStation Move games. The PlayStation Move navigation controller is an optional peripheral that gives players the use of an analog stick and directional buttons for titles like Heavy Rain or Killzone 3, where you navigate a character on-screen. If you would prefer, you can use the DUALSHOCK 3 or SIXAXIS wireless controller instead of the navigation controller to operate the left analog stick and D-pad.