Flash content is getting blocked in the latest versions of browsers. To enable it in Google Chrome, first open your browser and type chrome://settings/content/flash in the address bar or go there from menu "Settings / Privacy and security / Site settings / Flash". On a flash setting page, set toggle to Ask first (recommended). Now, with Flash enabled, whenever you visit a webpage with Flash content, you’ll need to click on the Flash player for it to start.
What do you mean? The game doesn't load? Follow the instruction to enable flash on a top of a page.