This was one of my favorite books as a kid and I downloaded the first version on my iPad 1 when my son was 1 year old. Three years later, it is still one of his favorite apps and gets played frequently. I will warn though that it is important to "read" it together a few times before letting your child play it on his own. It can be too scary, otherwise. Calloway makes some fantastic apps and this is one of them.
smallwisdom about The Monster at the End...