Several levels of difficulty are present (easy, medium, hard). You can choose to do a test comprising between 5 and 20 operations. At the end of the test you have summary with your results. You win three stars when you find the solution at the first try, when you make a error, you lose a star. After three star lost, you go to the next operation.
Updated on
Feb 22, 2022
Educational
Data safety
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Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.