A fun game to practice your four operation skills.

Find 4ops on AppStore.

Legal rights and Copyright: 4ops is developed by Yunus Zeytuncu (University of Michigan-Dearborn) and Omer Aydas (Cranbrook Schools).

Special thanks to 9Brainz for app development support.

Download the free game on AppStore.

Watch: How to play?

Read: How to play?

Contact: yezeytuncu@gmail.com

Frequently Asked Questions

  • Can you use fractions?

    • No, you can only use whole numbers (integers). When you perform division, you can only select numbers that will return a whole number.

  • Can you use negative numbers?

    • No, the game only works with positive integers.

  • Are there harder puzzles?

    • Yes, we will release more challenging puzzles in the next version.

  • Is each puzzle solvable?

    • Yes, we have a special algorithm that only lists solvable ones. We also sort the puzzles by difficulty levels. Thank you for helping us train our system by choosing the difficulty level of the puzzle for you at the end.