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The Community in more languages
Now the forum welcomes more languages.
You'll see a green translate button in comments and discussions to turn them into English
Please note that the boosters are saved to your device and not the game data, so you can use them when offline too. This does mean that any updates, crashes or device changes can cause these items to be lost. For this reason, we do not recommend storing too many of the won boosters as these can indeed be lost unlike Gold Bars. I can try to elevate this to a King Admin who might be able to help you but please in the future keep in mind that boosters can be gone with any changes in the game or, like in your instance, your phone died. They suggest using them as you play the game.