Wizards and witches, searching for a non-magical way to stay cool on warmer days, flock to the swimming hole. They cast invisibility spells on themselves while swimming, though. Being seen in public with sopping wet robes makes it appear as though they've had a spell backfire on them.
The Swimming Hole was released on June 20, 2013, specifically for Android Google Play devices.
On June 24, 2013, the Swimming Hole was released for iOS and Android Amazon Store devices.