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Geocast games are a new class of digital multiplayer games, inherently involving vigorous physical activity in outdoor natural settings such as parks, camps, or athletic fields. They are designed for commercial location-aware smartphones carried or worn by players, without requiring consoles or Internet connections. The iTron Family of geocast games illustrates how physical athletic play can be combined with real-time strategic, imaginative, and creative cognitive play from the domain of digital games to produce sports of the future appealing to a wide range of ever more sophisticated players. This paper describes the family and its variation points, as well as its implementation in a smartphone prototype, and an initial evaluation.