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The article introduces geocaching, a GPS-based treasure hunting game using smartphones to locate hidden containers worldwide. Players find geocaches, log their discovery on the website, and may exchange items. The practice originated in the early 2000s, inspired by earlier games like 'letterboxing.' Variations include multi-cache challenges, 'travelling caches,' and 'webcam caches.' Geocaching can be a solo or group activity, even at events. The author suggests trying geocaching and possibly meeting at an event.