When you use microsoft Edge, the images/video's might not show ... Better use another browser that works.
Below are some dance checkers that I made to kill some time, if I get the time I'll update them.
a direct link to them is http://www.paradisedancers.be/checkers/index.html
and without moving the mirrordancer http://www.paradisedancers.be/checkers/nomirror.html