Pokémon Go is breaking download records all over the world. Players hunt down virtual monsters in the real world. The principle behind Pokémon Go is very easy – the app uses a smartphone’s GPS to indicate whether there are currently monsters to be found in a player’s surroundings. Then, they just need to be caught. Peter Esser is 23 years old and has been playing since the outset. He plays whenever gets a free minute and his life has changed.