It's a flash-card style review of addition and subtraction designed to improve proficiency and confidence in basic math. It's easy, reinforcing, and mildly addictive. There is nothing that needs to be set up. After you finish a session you can choose to view how you did and print a summary with review problems based on what you missed. Difficulty can be set from just adding numbers from 0-5 up through multiplying and dividing 0-15 such as "180/15="