Due to the Flash Player reaching end-of-life, it is no longer possible to load this content directly on this page the traditional way in most browsers. However, thanks to a project called Ruffle significant strides are being made to emulate Flash. Currently only ActionScript 2.0 content is fully supported and functionality isn't perfect yet for ActionScript 3.0. But you can toggle between Ruffle and Flash Player modes below (currently works best in Google Chrome):
Load The Cell in Ruffle | Load The Cell Using Flash
If you'd like to support the development of Ruffle, check out its Open Collective page.
An interactive game I made for my Bio class where you can see all of the major organelles of a living cell.