Killer Mask is one of the three skins released under the monthly Dark Dimension Zone offer. It could be individually purchased with game coins in early August 2018.
Killer Mask could be purchased in the Skins Shop under the 'Dark Zone' 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 Dark Dimension Zone offer with Killer Mask has been released multiple times since its original debut. The cost for Killer Mask remained at 690 coins for every limited time release.
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Killer Mask - Full Size