FindMe, the image game

FindMe is a game where you must find items or landmarks and take pictures of them. You can challenge friends to find an item of a given kind or a landmark somewhere. The shot pictures must match the item kind or must correspond exactly to a landmark photo to be accepted. Once the challenge is completed the player who created the game will receive a notification with the picture shot by the other players.
FindMe only needs internet access and camera permissions to be used. Existing photos in the photo gallery are not accessed/used.
Optionally:
- pictures taken may be saved (added) to the photo gallery
- users may grant location access to either create geolocalized pictures, or to help find their way on a map to find existing geolocalized pictures