"Pokemon Go" is a game that can be downloaded via a free app on any smartphone -- either iPhone and Android.
The game collects settings from users' phones, including GPS and the local time, to detect where and when they are active in the game. With that information, developers have generated Pokemon that appear around users and in the environments near them.
The combination of the game and the real-world element is called augmented reality.
As users move around and seek out the characters, Pokemon appear depending on where they are and what time it is, Vox reported.
The game instructs the user, referred to as a Pokemon trainer, to track down and capture the Pokemon characters in public places.
The game encourages players to get up and out, taking users to different locations. Some have said that the game encourages users to exercise and see other things beside their phone screens.
A lot of people who play the game say it's fun and that they have created meet-up groups to play the game with friends and strangers.