Picture showing additional zones in Windows ...

Picture showing additional zones in Windows : in addition to the four green squares, there are 4 more blue squares (one of them is surrounded by a blue frame for example) - 2 horizontal and 2 vertical, and one orange square, consisting of cells that are extra for green and blue squares. In all these squares, the numbers are not repeated (thus, all candidates 7 and 1 can be removed in the orange square, 4,5,8 in the highlighted blue, etc.). A total of 18 squares in Windows.