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 the Killer Mask skin was released again for a limited time in October 2022. The cost for Killer Mask remained at 490 coins for this release.
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Killer Mask - Full Size