Adobe stopped their support of Flash in December of 2020. Any browser-based Flash games or programs will no longer work.
If you have a product that runs Flash off your computer (not using the internet), then as long as Flash remains installed on that computer, that product should continue to work. There have been claims that recent updates to the Window operating system (and others) will uninstall Flash permanently. You'll want to know if and when that may happen so you can prepare for that transition.