Jellyfish Ball is one of the three skins released under the Happy part of the Pet Balls offer. It was available for individual purchase in early June 2017.
Jellyfish Ball could be purchased in the Skins Shop under the 'Happy Pets' tab for 690 coins. It may not be available for purchase in the future.
Details of this offer may vary depending on location and platform.
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Jellyfish Ball - Original Image