Just click the green flag and watch.
This is based on my other account's animation. https://scratch.mit.edu/projects/97811631/ -----------Updates------ 8-15-17 Changed the LED's motion to be smoother. 5-2-16 added randomness to the "testing". There is a 0.005% chance that all but the first one will be red for anyone who is wondering. (the first one is always green) For them all being green it is 2.6% (that is a lot better. [but still not very good])