Star Trek GO
This iOS game was created for my little sister’s birthday party. In it, you walk around a real-world location using your phone to look for items. (It’s not officially licensed or endorsed by the real Star Trek or anything.)
Since Location Services isn’t always accurate enough to do small-scale location, we fake it by using the device’s accelerometer to detect when the user is walking/running. Combined with a hard-coded timer, this ensures everyone takes roughly the same amount of time to collect each item and finish the game.