The free Number Ninja app is a math puzzle game that will challenge your brain and test your math knowledge. This is a free game to play on your Android device.

With this app, you will be able to improve your mathematical reasoning skills and calculation speed. It has an easy and intuitive interface that allows you to solve the puzzles quickly and easily. You can also use the hints that are available in the game to help you solve the puzzles if you get stuck.

The app has three levels of difficulty, and you can choose to play the puzzles in the easiest level or the most difficult level.

You can choose to play with the numbers from 0 to 9, or you can choose to use the complex numbers.