The Planispheric Disk was used by the Spanish Conquistadors to navigate unknown waters, or to hide their cargo. There is one in Megaville that has been divided into pieces and the pieces are sought after by several factions (Professor Pericles & Mr. E). The disk is supposed to be a key to finding the Cursed Treasure left in or near Crystal Cove by the conquistadors.

The first Mystery Incorporated found a picture of it in the Old Spanish Church, and it got them into trouble with the Freak of Crystal Cove.

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