You are trying to guess the number in this game. After each guess, the results will be written below and you will create your new guess accordingly.
+ sign how many digits are correct,
- sign indicates how many numbers are correct and where the place is wrong.

You can ensure that the numbers you are sure of are not deleted from the box by using the lock function. This is not a must, it's just a feature added for ease of playing.
You will also be able to use notepad by swiping the screen.

Pleasant games...