If you want to stimulate your brain and test your math, challenge yourself by tackling these number square puzzles. How to Play Number Square...Fill in the missing numbers. Use the numbers 1 through 9 to complete the equations.- Each number is only used once.- Each row is a math equation. Work from left to right.- Each column is a math equation. Work from top to bottom.Features...- 100 challenging mind bending levels- Great for all. Adults and children- Improve Math logic and problem solvingEntertain your brain, sharpen your math skills and improve your brainpower!