It is no secret that logic and math puzzles can help keep your brain sharp. There are already plenty of Sudoku style games available on the app store. Calcudoku is also worth a look. It comes with puzzles to test your math skills. Just like Sudoku, you can’t have repeating digits in any column or row. Each shape has a number equaling the product of the digits in it.
Calcudoku has an unlimited number of checks and hints just in case you get stuck. It keeps track of your best and average solve times. The app has a calculator just in case you need help multiplying and dividing large numbers.
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