I found a great game the other day which my tutor group loved called GeoGuessr.com
The aim is to figure out where in the world you are from a randomly chosen google street view map. There is a world map in the corner and you place a pin for your guess. The closer you are the more points you get. Where the game shines is when there are clues that students can google. One student googled a foreign word, discovered it was Portuguese and then found a street name to look up. They managed to get within 3km.