DropIt

Features:

After adding a friend in the app, you can send a "drop" to him/her. A drop consists of a hint (what the recipient sees while searching for the drop), a location (where the drop has been placed), and a message (what the recipient sees upon going to the location). Note that the sender can place a drop anywhere and does not need to be in that location to do so. Once the sender sends the drop, the recipient receives a notification to search for it as well as the hint. Upon reaching the specified location, the recipient will see the message.