Pokémon Go, a new app which allows you to capture and train virtual Pokémon in the real world, has become a worldwide phenomenon in just four days.
For many of us who were kids when the games first came out, it's a nice nostalogic flashback to the good old days: the game allows you to travel far and wide in search of Pokémon, battle with trainers at Pokéstops and Pokémon gyms – which are usually landmarks and attractions within a city.
Already, the stories about the game are coming in, like an American man who caught a Pidgey while his wife was giving birth, or the man whose house was turned into a gym and got flooded by trainers.
While the game is available only in America and Australia while Nintendo updates their servers, freelance technology journalist James O'Malley explained how it works.
"It's a really interesting idea," he explained. "Not only does it use augmented reality GPS to drive it, but it uses your phone's cameras to make it look as though the Pokémon is there in the real world.
"Lift your phone up and you'll see it."
So do you just gotta catch 'em all?