Octo's treasure chest is full of rewards, but to be able to claim them, you'll first need to be able to complete five levels with a single life. When the event is ongoing, you can enter it from the map screen by tapping on the Octo's Plunder event button at bottom right. Tapping the button will open a mini map. Complete the levels on the mini map with a single life and the treasure is yours! Once you have completed one round, you can try to complete the levels again to get a second reward.
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