If you gotta catch ‘em all, at least be safe rather than sorry, authorities have warned.
While playing the latest smartphone craze, Pokémon Go, a group of London teenagers had to be rescued from caves after getting lost, and another youngster nearly died after he was hit by a motorcyclist.
In California, USA, two men looking for Pikachu and Jigglypuff fell over a cliff.
The two crossed a fence and fell 30 metres when the slope crumbled under them, and had to be rescued by firefighters.
Elsewhere in the US state, a player was stabbed after the trail led him to a park.
The interactive game allows people to capture Pokemonsters using their smartphone cameras.
Players are guided to the characters via the GPS satellite system built in the smartphones.
It has resulted in groups of children, teenagers and adults wandering the streets at all times of the day and night with their smartphones held out in front of them.
London crowds have been visiting unlikely locations, including a cemetery, a sex shop and the headquarters of MI5.
Pokémon Go, made by Nintendo, was released about two weeks ago, and millions of people have already downloaded the game.