When users tried to play the game they were greeted by a message that said: "We are working to resolve the issue. Please come later!"
Update: The game is back online. Servers seem to have been restored to their previous functionality, which should be good enough.
Pokémon Go was offline for much of Saturday morning in the U.S. as a major outage has hit the game's servers around the same time the game has launched in more than two dozen countries
Players in the UK, as well as Holland and the US, were complaining that the reality game was down and wouldn't allow them to log in.
When users tried to play the game they were greeted by a message that says: "Our servers are humbled by your incredible response. We are working to resolve the issue. Please try again soon!"
The Pokemon Go official app later said: "Trainers! We have been working to fix the #PokemonGO server issues. Thank you for your patience. We'll post an update soon."
One devastated user tweeted: "I could definitely leave the house but what's the point if Pokemon go servers are down?"
There is nothing quite like the wommmmp of when "Pokemon Go" servers go down, but at least there is comfort in knowing you're not alone in your agony.
Tarek Mouganie said: "Been playing #PokemonGo for over two hours, server crashes, I look up and I have no clue where I am. Send for help."
Daniel Jackson tweeted: "So now what? Am I supposed to just walk around a sunny park for no reason? That's disgusting. #PokemonGO"
One desperate gamer even resorted to chasing a pigeon instead of catching Pokemon.
Author Aaron Giles tweeted: "Pokemon Go is down, people wander the streets chasing pigeons, carrying eggs for 5 kilometres hoping they'll hatch. Chaos."
Pokémon Go requires a server log-in to play; problems with server capacity delayed the game's global rollout following its launch last week in the U.S., Australia and New Zealand.
Pokémon GO is available in twenty-six new countries. As of tonight, Trainers living in Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Greece, Greenland, Hungary, Iceland, Ireland, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Romania, Slovakia, Slovenia, Sweden, and Switzerland are able to download Pokémon GO from the Play Store or App Store.