If you want to prank your friends, you can do it with Ghost on Radar. It is a free app that lets you simulate ghosts, monsters, and monsters using your mobile phone's built-in sensors. This is a game that allows you to get the best fun out of it, because it is not always so easy to realize that something is just a game.

With Ghost on Radar, you can pretend that you have a paranormal radar, that can detect ghosts, monsters, and all kinds of other super-natural beings. Your friends, however, will not believe you. If they do not know that it is a fake, they will definitely believe that the radar is an actual detector of ghosts.

You can move with the help of built-in compass in the phone. But, you can also change the speed of movement to increase the impression of reality.