[For Play Store]
1. Close the game and open the [Play Store].
2. Tap your profile icon in the top-right corner.
3. Select [My Apps & Games] or [Manage Apps & Device].
4. Look under [Pending Updates] or [View Details] to update the game.

[For Apple Store]
1. Close the game and open the [App Store].
2. Tap your profile icon in the top-right corner.
3. Pull down to refresh the page.
4. Tap [Update] next to the game.