Missing the articles (la, el) and lots of errors.
I bought this game hoping to fill my time on the daily commute by expanding my Spanish vocabulary. The first thing I noticed was the lack of articles such as "la" or "el" before the word. Now every Spanish student knows that Spanish words are feminine or masculine (or both, like "estudiante") and that you learn words along with their articles. While I could more or less guess the appropriate article, I thought it was quite an oversight not to include them in the game.
The second flaw in this game is major. The words are defined with a single word, not a whole definition, so you are presented with words out of context. For words that have multiple definitions, the game uses the one that is not used commonly.
The third flaw is just as flagrant. A number of words have the incorrect definition altogether.
Pass on this game... you will need to unlearn most of what it aims to teach.