Grandma is one of the three skins released under the monthly Skin'O'Matic offer. It could be individually purchased with game coins in mid April 2018.
Grandma could be purchased in the Skins Shop under the 'Skin-o-matic' tab for 690 coins. This skin was available for a limited time and may not be available for purchase in the future.
Details of this skin may vary depending on location, platform or time.
Note: The Skin'O'Matic offer with the Grandma skin has been released multiple times since its original debut in 2018. The cost for Grandma remained at 690 coins for every limited time release.
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Grandma - Full Size