The game fits in four rules
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One DNA per person
When you sign up, a signature unique in the world is generated for you. No two will ever be alike.
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One trade = one scan
You scan another player's QR code, the server validates the trade, and each signature lands in the other player's directory.
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Your DNA travels without you
Everyone who carries it can pass it on in turn. A trade in Geneva can take it all the way to Tokyo.
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The map tells the rest
Countries light up as carriers multiply. See where your signature has been, who carries it, and where the ones you collected come from.