How do I install the app?
Sudoku Spoiler can be installed straight from the web. Once installed it launches in its own window, like a native app, from your home screen or Dock.
Windows, Linux, or Android
In Chrome or Edge, open the menu and tap or click the Install button 
.
Mac
In Chrome or Edge, click the install icon in the address bar. In Safari, click the Share button 
and choose Add to Dock.
iPhone and iPad
Tap the Share button and choose Add to Home Screen.