(Not recommended due to possible security issues) Using a browser Firefox, Opera or IE, where you can install an older version of Flash Player and deactivate checking for updates. It is still in development phase but it develops very fast and already can be used to play many of the flash games online. We recommend you to use the second variant and install the new plugin Ruffle. Have in mind that the older Flash Player version might have security problems, since it is no longer supported and updated, and it is not recommended to install it. These are only instructions, guidelines and links to other websites, which can help you to install an older version of Flash Player which is still working or install the new Ruffle plugin which emulates Flash Player. This website has no relation with the installation files mentioned in this post. There are still two ways that you can use to play online flash games in your browser.
After January 2021 the Flash Player plugin is no longer officially supported.