**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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