This a limited-time-only event. In each elevator shaft you are given 4 crates to choose from - 3 contain prizes and 1 contains the evil Luna, who will steal your prizes! Your aim is to reach elevator shaft 50 without encountering Luna - then you get to leave with all the rewards you collected. If you pick the crate with Luna inside, then you can either forfeit all rewards gathered so far, or you can use an Elevator Ticket to keep your rewards and continue playing.