We (me and my 8 year old) loved the Dungeon one and really enjoyed, as a carry-with-you-for-when-you-are-bored item.
Also cool is their d6 pencil, so you can roll a dice without having a dice, very smart idea.
I am really inspired by ideas like this: you can generate engagement with simple things like a piece of paper and a pencil. And despite some of the comments, I love that they call it an "App" because it makes you think what is an app after all: the code? the fact it runs on a phone? or that fact that it is readily available to engage when you are bored?
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