To complete the quest, you need to go to the lobby of the game or tap the 'Advance' button, after which you will proceed there automatically. At the bottom of the screen, there is a mimic chest with rewards. Once you tap on the chest, you will collect the rewards accumulated there. To complete the quest, you will have to repeat this sequence of actions two times. You can wait for more rewards to appear or tap on the chest right away. If you tap on the chest immediately after collecting your first reward, you will not be rewarded for the second time, as it has not been accumulated yet. The progress of the quest does not depend on whether you collected the reward once or two times.