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You should note that my program's notion of "difficult" differs very much from the way humans experience diffculty when solving Sudokus, so should not take the "most difficult" statement too seriously.
There is work in progress to improve this situation. These Sudokus are irreducible, that means that if you delete a single clue, they become ambigous. These Sudokus are a bit easier to solve then the ones above. Most of them have 27 to 31 Sudokus given.
You can do whatever you like with these empty Sudoku grids. However if you publish your results I ask you to link to this page. That is you cannot have any number in a left, centre or right column twice within vertical set of 3 blocks.
This is a fundamental technique and procedure of my course. It is used throughout the whole course extensively. And now it is used worldwide. Makes me feel good seeing it was me who developed it. A Hopefully never!!!
If you complete the puzzle you can check yourself easily whether it is correct. The only time I look at the answers is to check to see if when trying new logic I am correct. This is dangerous.
It is so easy to look at another number nearby, which is really cheating and the temptation to put that number in is great. You need lots of self-discipline. Avoid entering any number you have seen until you have worked out the logic for it. A You have several options.
Try another puzzle. This can be messy. Try again.
The more techniques you learn the more the possibility of you missing a procedure or a technique. It is possible that you can solve a puzzle without doing certain techniques. You may be able to solve a puzzle using the Xwing technique while someone else solves the same puzzle using another technique. My course gives you a basic procedure to get going, then as you get into more difficult puzzles you may go a different direction.
The procedures I suggest are such that you can avoid missing opportunities and at the same time self correct as you go by using another technique. A Not necessarily 16 Q Lesson 6. Can you elaborate more on the Rule of Exclusion. A If you are using the technique of only putting small numbers in only 2 cells of a row, column or block, then you can exclude any other small numbers that may appear in that row, column or block.
I have prepared an addendum to show this more clearly. Re 3 small similar numbers in a block? I may have not made it clear. If a small number can go in a block in a line. One of the powerful features of Sudoku solving is keeping small numbers to 2 cells.
The advantage is that if you solve one number then you know the other number. If there are more choices once you have solved one cell, it may become more difficult to know what the other 2 cells should be.
There are times when you get to the very difficult puzzles where you will need to put in more than 2 small numbers in a row, column or block. There are many ways to solve a puzzle once you have many procedures and techniques..
I suggest Xwing as only an option if you get stuck. Xwing , skyscraper and swordfish patterns are hard to spot.
Is this deliberate? A Sometimes yes, sometimes no. I some cases I want to show that you can miss something but find it later, and sometimes you simply miss it by mistake. It is not the end of the world. Everybody does it including me.
Later in the course I show you techniques to check yourself to see if you did miss something. You can download the ebook immediately and start solving the puzzles. No waiting for snail mail. Ready for some fun? For just 4. No hard cover copies are available at this time.
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