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epa05427920 A gamer displays the Pokemon video game on a Game Boy (L) and the Pokemon Go app on a smartphone (R), during a Pokemon Go walk at the Stephansplatz in Vienna, Austria, 16 July 2016. The game, that uses the GPS to locate the smartphone's location, has gained a huge popularity among smartphone users and added to the value of Nintendo that partly owns the franchise enterprise that makes Pokemon. EPA/CHRISTIAN BRUNA