A crossover interactive transaction system and method includes a server, a network, portable devices and terminal devices according to the preferred embodiment of the present invention. The server is provided for a platform provider. Each of the portable devices is provided for a real customer. Each of the terminal devicesis provided for a bricks-and-mortar store. Via cables or in a wireless manner, the server communicates data with the portable devices and terminal devices via the network. Thus, in the real world, the real customers can find transactions marked in virtual stores in a virtual world and interact with the bricks-and-mortar stores and corresponding to the virtual stores. Each of the transactions includes transaction data of a site, a mission and a reward for example. The site can be a bricks-and-mortar store or a tourist's attraction. The mission can be listening to introduction of products, testing food or advertisement for example.
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