In less than a week since its initial launch in New Zealand and Australia on 6 July, Pokémon Go has become a bona fide global phenomenon. The free-to-play game blends real world location data, shared-world multiplayer, augmented reality and the iconic Nintendo series to create something both familiar and unique.
It's so different to any other Pokémon game that it requires a great deal of time to really get to grips with how it all works. Catching Pokémon, fighting them and the function of gyms, it all works very differently to how it does in the games fans will be familiar with.
As Pokémon Go continues its roll-out around the world, we thought we'd venture out into the heart of the British capital to see what we could find and explain how it all works in practice.
We headed to Big Ben, Trafalgar Square, Piccadilly Circus and Tower Bridge to see what we could find.
Pokémon Go uses location data to populate the world with the original, first generation line-up of 151 Pokémon, as well as item-filled markers and gyms to be contested over between the three teams players can assign themselves to.