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 Multiplayer Pong in Ruffle | Load Multiplayer Pong Using Flash
If you'd like to support the development of Ruffle, check out its Open Collective page.
A simple multi-player pong game where the player on the left uses SHIFT and CTRL to move up and down, and the player on the right uses the UP and DOWN arrows. There is no set winning score so you’ll have to decide on that yourself.