Generate an help-step
When you modify a cell value, a candidate, when you cancel a value or you use color help, a new help-step is added.
This allow you to follow your work and to easily come back to correct a mistake or a wrong supposition.
Navigate between steps by swiping to the left
Display progressive clues to learn new techniques.
You can use this help-step to come back in your research of the solution
You are not required to follow the help to the end
Place a value, or a candidate, the help is not complete, it is abandoned and the changes it brought are deleted.
This allows you to simply be inspired with these helps.
Color the helps by drag & drop with color-button.
So you can find your actions when you'll test values
Build the entire sudoku-solution.
This does not prevent you to go back to work techniques. On the contrary!
When you save a sudoku, your progress is saved
Double tap on a modified box to access the concerning Help Step
So you can easily go back and understand how the value was determined