Nintendo DS software for learning English

Master ENGLISH on Nintendo DS.

Somewhere, I know, there is a Nintendo DS game that can help me finish learning English. I do not want to learn just BEGINNING English, or just a little vocabulary. I need to learn sentence structure, and to understand the differences in every form of speech. I need to pass the TOEFL -- the Test of English as a foreign language. I understand there is such a game out, but I do not know what it is.