Whether you love it or loathe it, you've got to admit that the Pokémon GO craze is more than a bit fascinating – and the secret history of how it was created may be the most interesting thing about it.
So what's the inside scoop on Pokémon GO? It turns out the idea was actually spawned back in 2014 thanks to a Google April Fools' Day joke.
Using Google Maps it created the Pokémon Challenge, a mini-game that encouraged you to try and capture the fictional monsters when using the app.
Releasing the video you see below, the company wrote:
"Dozens of wild Pokémon have taken up residence on streets, amidst forests and atop mountains throughout Google Maps.
"To catch 'em all, grab your Poké Ball and the newest version of Google Maps for iPhone or Android."
At the time, Pokémon GO developer Niantic was part of the Google empire, and its CEO John Hanke apparently took the idea more seriously than most.
Niantic eventually split with Google and the rest, as they say, is history – Pokémon GO is now bigger than the likes of Tinder, Facebook, Snapchat and Twitter.
Not bad for a prank.
Watch: What is Pokémon GO?
Have you downloaded Pokémon GO yet? Let us know what you think of the game in the comments below.