free printable sudoku puzzles ::
HARD ::
Tips/Ways to solve the Hard Sudoku puzzles
* Start at number 1.
Use the same logic from an easy puzzle to fill in every empty box with all of the possible numbers for that box. If possible, put in definites.
- In a hard Sudoku, you would not be able to solve from the start, so just fill in what you know it could be. This will help later when you have two or three options per box and you cannot remember what they are…
* Note that if two boxes in a block, column or row must be one of two numbers, you can use those numbers to eliminate other possibilities.
For example, in a block, there are four open boxes. From your analysis, you have determined that:
- box A can be 1, 2, 3, or 4;
- box B can be 1, 2, 3, or 4;
- box C can be 3 or 4; and
- box D can be 3 or 4.
- From this we know that box A and B cannot be 3 or 4, because they have to be either 1 or 2. Box C and D have to be either 3 or 4. This information might be useful in solving other boxes.
* Recognize that hard Sudoku’s can take time – a very lot of time.
A hard Sudoku can actually take days to complete, but they are still fun. The harder they are, the more fun it is when you finish. A hard Sudoku can be solved the same as an easy one, it just gives you less to start with. The logic of a hard puzzle is that if you know everything that can go in every box, it is very simple.
- For example, say you have two possible 2’s for a particular nine-square box, and they are in a row or column and you know that 2’s cannot go anywhere else in the nine-square box. This means that you know that the row or column those 2’s are in cannot have 2’s in it except in this nine-square box. This sounds confusing, but when applied, it is actually very easy and it helps a lot…
* Consider this alternative, way to always solve a puzzle accurately and quickly.
In this method, fill in each block with all the possible numbers that could go there. Write all the numbers small at the top of the block. You can recreate the puzzle on bigger paper to help with this. Write all the numbers that do not appear in that row, column or square. Once you have done this for a whole column or row, start filling in the obvious answers. You will have solved the puzzle by the time you do this for every row.
Below are some example free printable sudoku puzzles for kids..
Click on each image to open the template of each free printable sudoku puzzles….
printable sudoku for kids :
sudoku puzzles for kids :
sudoku puzzle for kids :
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easy sudoku for kids :
free printable sudoku puzzles :
