This shows fast flicker, strobing tracers and rapidly changing colour. Visuals like these can trigger seizures in people with photosensitive epilepsy, including people who have never had one before. Stop at once if you feel dizzy, see altered vision, twitch or feel disoriented.
Choose how it runs. You can change this at any time from the bar at the bottom.
It also plays a rising ringing tone. Volume is in the bottom bar.