Crystal Cave is part of a series of Field Day games called The Yard featuring a cast of kid characters who hang out in a junkyard and use games to understand concepts (informed by the work of UW–Madison scientists) including the water cycle, earthquakes, antibiotic resistance and other topics. Crystal Cave gives players the power to makes crystal structures from atoms, and manipulate the crystals to make materials with properties that are useful in applications like solar cells or computer chips.