If you’ve ever played Sudoku, you will know it offers a number of benefits, namely, that it brings a sense of order and calm, it helps your brain stay healthy, it provides an escape (however temporary) from reality, it is good for adults of all ages as well as children, and it actually can help get rid of that pesky “earworm” that has been plaguing you all day. Here is our list of the best Sudoku apps for iPhone.