Install the app
Tap the Share button in Safari, then "Add to Home Screen".
Open your browser menu (⋮) and choose "Install app" or "Add to Home screen".
Tap the menu (☰) at the bottom of the screen, then "Add page to" → "Home screen".
In Safari choose File → Add to Dock: the game opens from the Dock like an app.
Save the file on your desktop and open it to play this game.
In Chrome or Edge you can also use the browser menu (⋮): "Install" or "Create shortcut".