The developer has done a beautiful job on this application; however, in order to get the full alphabet of idioms, you must pay for packs. I am fine with this, by the price of the packs is way too high: 2.99 for 70 (x2) and 4.99 for 140 (a deal, apparently). I think the developer will get his/her money worth if these packs are made cheaper. Very few people will pay, otherwise. I will be purchasing all the packs when the price becomes more reasonable. That said, I love the illustrations and everything else about this. Reminds me of Icon Books Introduction Series. Thanks:)