The eBook versions are fairly straight forward. You see a diagram with the choices. You cannot see the answer until you go to the next page on your device.
With paperbacks it is a little more complicated. You need to cover up the current page with a sheet of paper or card and move it down one line at a time. When the choices are displayed, do not move to the next line until you have chosen the move.
To make this easier, there is only one column on each page. The instructions are in each book.