Basic Overview

This particular puzzle is in it's beginning stages. And within it you will notice, already, the different types of dottin.

In grid 1 (upper left) you will notice 2 dots showing the possibility of the value 6. Also 3 fainter dots showing the possibilities of the value 3.

In grid 2 (upper center) You will notice the number 2 solved and also a pair of dots showing the possibilities for numbers 3 and 4.

While in grids 3 (upper right) and 4 (center left), you will notice that the cells are not only dotted but also have a line drawn around the inner edge of the square.

This is done when the square is "LOCKED IN" that is the cell has only 2 possible values for it.

"Locked in" cells have some interesting properties, that I will discuss in the next post.