Hundreds of enthusiastic gamers descend with their mobile devices on central London to gather for the first mass Pokemon GO Lure Party in the UK since the game was launched on July 23rd 2016 in London, United Kingdom. Pokémon GO is a free-to-play location-based augmented reality mobile game developed by Niantic for iOS and Android devices. It was released in most regions of the world in July 2016. Making use of GPS and the camera of compatible devices, the game allows players to capture, battle, and train virtual creatures, called Pokémon, who appear on device screens as though in the real world.