Ingress pits two teams against one another with portals up for control in cities around the world. These portals, which are simply real world landmarks, can be claimed for a side if their players check in at that spot. The narrative depends on the actions of players and is shown in a number of live-action, news-style report videos that players can watch in the game.
The game has been a bit of a hit since its release. It has been downloaded 4 million times on Android and in the first half of this year, real-world sites have been interacted with more than 22.4 million times.
Google’s Niantic Labs released a trailer for the game, which should give you an idea of how it works. If you want to explore an area, take part in a fun game, and you’re not as bothered about showing off your check-ins, Ingress is worth a look.