GeoGuessr is a great Geography game for both students and adults. Using Google Street View you are randomly put somewhere on Earth. Using your observation skills you need to determine where on Earth you are and plot your best guess on the map of the world. The closer you are the more points you score. You do have the ability to set a time limit and create a challenge among friends or students. This would be a great way to start or finish a Geography lesson or use as a general challenge for your students. Playing this game can only improve your knowledge of geographical and man made features. Below is a screen grab of what GeoGuessr looks like.
Geoguessr