Game Version
You should always use the latest game version as there may be fixes and new updates. Using an outdated version may cause unforeseen issues to your game.
To check for game version in game:
Open game, go to Settings Menu and the version is listed at the bottom right of the screen
To check for game version if you can't open the game:
Open App Store, search game name (or Storm8), click on Restaurant Story 2 app, on the left side, under the logo it will show current game version
