Sudoku Hints For Harder Puzzles
Sudoku Hints To Solve For Multiple Missing Numbers
Here is another neat trick to help you solve cells when there are multiple cells missing.
This probably wouldn't happen often, but when it does you will want to know this hint.
In the upper left region of the graphic at the left there are four cells vacant circled in red.
You will notice that three of those cells make up column 3.
Counting from 1 to 9, you find that 1, 3, 5 and 7 are missing in the upper left region. Again counting from 1 to 9 you will find that 1, 3 and 5 are the numbers missing from column 3.
Since 1, 3 and 5 must go into column 3 somewhere, you can deduce that the 7 must go into cell (R2,C1). Write it in.
Now let's try solving for the other three missing numbers 1, 3 and 5 from the upper left most region.
Analyzing row 1, you can see that there already is a 3 and a 5 in that row. This means that a 3 and 5 can not go into cell (R1,C3). The only possible remaining candidate is a 1. Write it in.
You are making great progress.
Now you have two numbers 3 and 5 that are missing from the upper left most region.
Examining row 2 you will notice a 5 in that row. Since the only two numbers left are 3 and 5, and a 5 is already in row 2, then you can conclude that cell (R2,C3) must be a 3. Write it in.
The only remaining cell (R3,C3) has to be a 5.
Great job! You just learned another great Sudoku hint. Now try solving the lower right region using the same technique.
