In Pokémon Go a player take the role of a "trainer", travelling to real locations to "catch" virtual Pokémon that can be found using a smartphone's Global Positioning System and camera.
For the most part, it's been harmless fun.
But people chasing the virtual Pokemon Japanese cartoon characters that appear to pop up on their smartphones have been accused of disrespect by seeking them out at Arlington National Cemetery outside Washington, DC, and Holocaust Memorials the United States capital and Berlin.
The Holocaust Museum in Washington, D.C. has asked people to stop playing the wildly popular Pokémon GO game within its walls.
In Poland - where the game is not yet officially online - Auschwitz issued a warning.
It is also reported to be a Pokestop, meaning players can collect items including Pokemon snacks and medicine. Not just normal museums, either, but rather sensitive museums like the Holocaust Museum.
The smartphone game allows players to hunt virtual Pokemon in the real world, thanks to an on-screen augmented reality overlay.
To make matters worse, disputed reports have surfaced that a poisonous gas-emitting Pokemon character called Koffing can be found in the museum.
While the game was released in the US, New Zealand and Australia last week, its debut in Europe has been nearly desperately awaited, so much so that some 2,500 Berliners signed up to start a protest planned for Saturday.
The current site of the former Auschwitz Nazi concentration camp is many things.
As yet, Niantic - the developer for Pokemon GO - didn't respond to the museum's request and complaints, so it remains to be seen whether or not the museum's area will be removed from the game.