Have you ever experienced the Tetris Effect?It has been known for players of first-person shooter games to briefly panic upon noticing the lack of a crosshair in the center of their real-world field of vision. Some players of Dance Dance Revolution also report seeing arrows moving upwards when closing their eyes after intense play.![]()

					
				

						


















					
					
					
						
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 . It was kind of scary.
						

						
					
						
						
