How do I install the app?
Sudoku Spoiler can be installed as an app on your device. It launches like a native app from your home screen.
Android (Chrome)
Open the side menu and tap the install button:

Alternatively, tap Chrome's menu (three dots), select Add to Home screen, then tap Install.
iOS (Safari)
Tap the Share button (the square with an arrow pointing up) and select Add to Home Screen.