Smithsonian Hope Diamond: Players take on the role of a new recruit for the Hidden Expedition League of Preservation (H.E.L.P.) team who is tasked with finding missing shards of the Hope Diamond before a gang of thieves do. Smithsonian Castle: The adventure takes us back to the Smithsonian to uncover a mystery that dates all the way back to the founding of the institution. The player will have to dig deep into the Smithsonian's history to find the answers to the unusual and mysterious events of the present.