Walk, Run or Jog. Doesn't matter if in a treadmill or in a park. Your real motion gets transltaed into virtual reality. Incase you don't have enough space for walking, just stay in your place but move your feets like you're walking or running. You can also shoot the red cubes simply by using your gaze.
*Please try inserting the phone in cardboard in different ways incase your walking isn't detected or you automatically walk inside the game.