(For Windows) You can download the Hero Fighter game by clicking here.
If you want to play Hero Fighter without downloading and installing it, you can...
(For Windows, Mac and Linux) Download Flash Player projector (choose the non-debugger version) by clicking here. And then run the Flash player projector and open location "http://herofighter.com/game".
(For Windows) Get Chromium Browser 87, run it with the PepFlashPlayer plugin and then open "http://herofighter.com/play" in the Chromium browser.