Open your files app. Find the game and click/tap it, on android it will ask you what app you want to open it with, select one of your browsers. If it gives the option to use the android HTML viewer, it won't work. So pick a browser to open the app instead.
If you are a Chromebook user, just find the file in your files app, and double-click it to open it just like any other file. It will automatically open in your browser.
