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Mask Storage is a purple shelf found in certain levels that can be used by any explorer to store masks they find. The following levels possess Mask Storage:
Hell
Level 0
Level 11
Level 47
Level 112
Level 130
Level 153
Level ⎳
Pseudo-Level 0
goofuslang's division
Rio's Nexus
are you lost?
Memory Library
The Baddies Cafe