Yes. You can carry over your Guest Play data by choosing Choose LINE Login in-game.
If you already have play data with a LINE Login, you can choose either to use your old LINE Login play data or to create new LINE Login play data based on your current Guest Play data.
However, if you choose to carry over your Guest Play data to make new LINE Login play data, your old LINE Login play data (all data including for paid items such as Rubies) will be deleted, so please choose carefully.
Furthermore, it is not possible to revert data from a LINE Login back to Guest Play.
Furthermore, Guest Play data including purchased items can be lost as a result of uninstalling the app or for other reasons.
Lost Guest Play data can't be carried over, so please try to play using LINE Login wherever possible.
Let us know if we can make it better.
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