The 2016 Olympics have been plagued with problems -- from apartments in uninhabitable conditions to toxic, waste-filled water. But perhaps worst of all: There's no "Pokemon Go."

The app has launched in more than 30 countries, but Brazil isn't one of them. And Olympic athletes aren't too happy about it.

Some athletes took to Twitter to air their grievances, like British athlete Joe Clarke, whose app showed no PokeStops or Pokemon in sight.

Last month, Rio's mayor asked the company on Facebook to make the app accessible in Brazil before the games.

He said, "Hello, Nintendo! There are 23 days until the Rio 2016 Olympic Games. The whole world's coming over here. Come too!"

Niantic Inc., the company that created "Pokemon Go," has yet to set a release date for the app in Brazil.

The opening ceremony for the games is Friday.