This is a bonus you get when you level up in the game. After passing a certain level you get bonus chips and/or diamonds.
Until now, this bonus was not visible and was automatically added to your total balance. Now, upon raising a certain level, you will see your bonus in the "Bonuses" section, which is located on the homepage of the platform! There you have a separate field "Levels", where you will see the bonus for a specific level reached, as well as the bonuses you will receive in future when reaching next levels.
IMPORTANT: Uploading a certain level will activate a button to claim your reward! If you do not press the claim button, the bonus will not be credited.
If you didn't claim the Bonus immediately after leveling up, your reward is not lost! The button will be active until you press it and collect your bonus!
In case you have several levels uploaded for which you have not claimed your bonus, then your system saves them and they remain active until you collect them.