Solving Sudoku Part 5

We’re almost at the end of this series of posts now. Here’s where we left off…

Two more rows.

We just filled in the two marked rows and now need to move to the rest of the puzzle.There are a number of different ways to go from here but let’s see if you can see how the middle left container was filled out. It needs a 5, 7, and 8.

Solve another container.

Again, go back to gimmie logic and the 5 becomes obvious. Once you have that look at the columns for the 7 and 8 and place them where there won’t be any duplicates in the two columns.

Now we go even faster as the solution reveals itself. Here are the next three numbers to fill in. Figure out how…

Three more squares.

The 3 should be obvious; it’s the only number left in that column! The 6 and 9 are all that’s left in their column so the crossing rows fix those in place. Again, gimmie logic at work. You use it quite a bit when solving Sudoku puzzles. It should be second nature to just look and see how the two numbers involved fall into place.

Now let’s look at the upper right container and two other squares. The container needs a 3, 5, and 7.

Another large chunk.

The 3 is given by gimmie logic going across the top row of containers. The 7 is given by using gimmie logic going up the right column of containers. Then, once you have the 3 and 7 the 5 naturally falls into place as the only number left.

The bottom two empty squares (green above) needed a 1 and 5 so when you put in the 5 you automatically defined where the 1 and 5 would go in those two squares.

Almost done now. Let’s look at what’s left…

Do the final solution yourself.

Solve those on your own. It will be easiest if you start with the green squares, then the yellow squares, and finally the orange squares. Don’t peek until you’ve got them.

. Sleep

. [Cue the Jeopardy! theme music.]

. Sleep

. Sleep

. Sleep

. Sleep

. Sleep

. Smile1

OK here’s the final solution…

The solved puzzle.

That’s it. Did you get them without looking? I hope so; if you’ve been following along you had the tools needed to solve the puzzle and a great many other puzzles. This one was listed with a difficulty level of 4 out of 5. Of course, difficulty levels are somewhat subjective and this might be an easier puzzle in a larger newspaper which tend to print harder puzzles; particularly at the end of the week.

There are other logical methods available to help with solving Sudoku puzzles. They were not needed for this puzzle but when I run across an example of one of them I’ll make another post describing that method. So, stay tuned.

Thank you for your attention for this series and happy Sudoku solving. Smile

The Series