Other games have experienced minor graphical differences from their original versions as well; most of these changes (as well as several others) were done due to Nintendo being more cautious about epilepsy, since many of the games during that time employed high flickering of color patterns that engulfed the screen. "F-Zero" (SNES) eliminates the track dimming when the player runs over the edges of the track, and Nintendo 64 games render polygons at a higher resolution than in their original hardware (though sprites and text appear blocky and pixelated by comparison). In "", the screen turns red upon the player losing a life, whereas the original employed a rapid screen flash (Nintendo has yet to use such an effect since the Dennō Senshi Porygon incident in 1997).