I have been volunteering in a group to teach children from low-income family Math and English. I found out some kids are struggling to simple math like addition and subtraction (since they rely too much on their fingers to do the math). so I created Math Jutsu to help them familiarize with mental calculation. Hope this will help others as well.
Very cool game. Best score is 41 so far. Gave you a quick review and 5* rating in the Android store.