Harder than it looks
The system seemed so simple at first, it seemed like something you would put in the classroom for an elementary grade school student. I now doubt you should even put this in a high school classroom! You really have to be careful of making the right combinations. I do not think there are any "1"'s here, as that would be impossible to beat. Word of advice to players: be sure to start with hitting a "3" with any odd number. The graphics are nice and original, especially with the flying letters that build on each other.