There are free gems hidden on each screen of Duel World. By tapping on certain background items, a little animation will play. If a special animation plays, between one and five gems will be awarded. This is random but each spot may work more than once a day. To see the animations, tap on:
The fountain next to the Gate.
The lights leading to the PvP Arena.
The dome above the card Shop.
The trash can in front of the Card Studio.
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