And now, even bookstores are getting involved and playing a pretty significant role as PokéStops or Gyms in the game.
Some are even dropping Lure Modules to attract more players.
"For people who aren't avid readers or buy their books online, I think you might actually notice the bookstore that you've passed by quite a bit," Whitney Hu, the store's communications director — and a big Pokémon Go fan herself — told BuzzFeed.
Hu went on to explain how Pokémon Go players are influenced to buy books while they're catching Pokémon as well.
"We've seen a few people linger outside but mostly people are using Pokémon Go as an excuse to come to the store. It's a fun experience to catch Pokémon within the stacks, but for any book lover that's also a Pokémon trainer, the hardest thing to resist are books. So quite a few people are catching Pokémon and picking up a new read."