Content access
Day passes are ways for newer players to access old content that typically required the purchase of a Mr. Store item to unlock.
The very oldest Mr. Store items simply generated items that allowed access to the content and could be freely traded to anyone else. Newer content has day passes, these passes have to be farmed by owners of the Mr. Store item and cannot be used by them, instead they are traded to other players and when used grant access to the Mr. Store content typically for a day until the following rollover.
Content unlockers
The following items are from the oldest content and can be found easily in the mall in the "Content Unlockers" category (except for Batfellow comic). They are the only way to access the related content, Mr. Store owners can generally generate these.
Day passes
These provide temporary access to content that Mr. Store owners have permanent access to. Only 5 of these are currently in the mall Content Unlockers category.
