In case you play without Internet connection (off-line), the game progress is saved in a file on your device.
Meantime, we would like to call your attention to the following specific case - if you play off-line and when turn on Internet connection and update the game straightaway, your in-game progress gained while playing off-line won't be saved. To update the game and get the game progress saved, one should follow this way:
1. Employ the option that arranges time and date automatically in device settings.
2. Open the game with Internet connection enabled.
3. Your progress will synchronize with the server, after that you can update the game.
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