How do I buy all packs? – Mysteriez: Find Hidden Numbers Review

I have tapped on everything and can't buy anything, but hint upgrade. I am disappointed because I was looking to buy all packs to take on vacation. I will not have internet available and would like to get full game before I go. Seems fun, but won't be able to play past the first free levels.
Review by Nimbette on Mysteriez: Find Hidden Numbers.