The exercises are very interesting and it works really well. The choice, in my opinion should be filtered for something better. When searching for a single word, should 3 single words to choose from. When searching for a question should 3 questions to choose from and not a question of a word and a declarative sentence. This makes the installments easy. This is program-but only a little thing, and should be easily recoverable for the developer.
All in all, to traveling to intersperse a few words in the local language or to get a successful tutorial to get you started in a new language.
From me there is a recommendation to buy here. If the selections would be adjusted in the exercises a bit, I would be very happy even 5 stars.
