Example 5 step by step solution

Place the 1s in the puzzle.  Include the ones notation if it is narrowed down to two squares in a box.

 

Now insert the 2s:

 

Now insert the 3s:

 

Now do the 4s:

 

Now do the 5s and 6s:   (notice there are no 5s that can be found.) The 6 is located because the upper Rt box the 6 will be in the bottom row.)

 

Now the 7s:

 

Now do the 8s:

 

Now find the 9s.  Remember about two numbers in the same squares lock up those squares.

 

Now go back through the numbers 1-9 and they will be shown in green.

 

Now find the 2s

 

Find the 3s and 4s:

and

 

Next find the 5s:

 

Find the 6s:

 

Find the 7s (none) and the 8s:

Note: you know where the center middle box 8s go because the 8s in the boxes above and below are both in the outer columns.

 

Now find the 9s: (notice squares that get locked up.)

 

Now we go back through the numbers again ... colored in blue.

 

Find the 2s: (this locks up some squares and shows you where several other numbers now go.)

 

Next find the 3s:

 

Now you can write in a lot more numbers that must go in certain squares plus work on 4s and 5s.

 

You now can find a lot of numbers .... 8s and 9s as well as others that will fall in place:

 

Last ... it is easy to finish all the rest of the numbers in the squares.

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