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Rock Paper Scissors is one of the world's most widely played hand games. Its origins trace back to China during the Han Dynasty (206 BC–220 AD), where it was known as "Shoushiling" — literally "hand command." The game spread to Japan, where it became "Jan-ken-pon", and then to Europe via trade routes in the 1800s. Today, it's played by billions of people worldwide as everything from a casual tiebreaker to a competitive sport — yes, there are actual Rock Paper Scissors world championships.
The game's enduring appeal comes from its perfect balance: each choice beats exactly one other and loses to exactly one other, creating a pure three-way symmetry with no dominant strategy in a single round. This makes it simultaneously a game of pure chance AND psychology.