The application searches a growing online crowd sourced database of pinball machines (currently over 4000 worldwide).
By using your iPhones/iPads current location the application is able to help you find your nearest machine or pinball event and enables you to upload a new ones that you have found or know of.
The data is crowd sourced and relies on your contributions.
You can browse through the search results, select a machine/event and pinpoint its location via the link into the iPhone maps application. The smiley faces give you a clue to the pinball machines condition.
You can also set up an alternative location via the Near Other Location disclosure button and use then Near Other Location main menu option to see the nearby machines. This allows you to find out the machines available at locations you plan to travel to.