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It's one of the first popular games to use "augmented reality" - a kind of cross between real life and an online world. The game makes it look like Pokémon appear in real life places by using the GPS and camera on your phone.
It's already become a craze in Australia and America, and has made it's way into the news across the world.
Please read the full article from the NSPCC here, where they take you through what you need to know about the game and how you can help keep children using the app safe.