This FREE app for the iPhone/iPad is simple to use. Scroll through the 100 + riddles within the app and double tap to reveal the answer. You may already know many of these riddles – they are not necessarily new. But… they are kid appropriate. The only one that was a bit “off” is: If a fire hydrant has H2O on the inside, what does it have on the outside? K9P. The app has an index to the riddles included. There is also an option to email a riddle to a friend. I have always been a fan of riddles because they make kids think – brain exercise for elementary-aged kids with a smile or two along the way. 🙂