How To Play Sudoku - Only One Possible Box In A Row Or Column
When looking at a group of three mini-grids, you can try to determine where to place a certain number. When using this trick, you may want to use a pencil and eraser so you can wipe out your markings.
Look at three mini-grids that run across or down a sudoku puzzle. Pick a number from 1 to 9 that does not yet appear in all three mini-grids.
For each mini-grid that does not yet contain the number you picked, look across the rows that run through the mini-grid for the number. If the number appears in a row, the empty boxes in the row cannot contain the number. Place an x in each empty box in the row.
After you finish scanning the rows and columns if only one possible empty box in a row or column remains, the number belongs in the box. You can fill in the number right away. If you are left with more than one possible empty box, you will have to fill in the number at a later time.
For each mini-grid that does not yet contain the number you picked in step 2, look along the columns that run through the mini-grid for the number.
If the number appears in a column, the empty boxes in the column cannot contain the number. Place an x in each empty box in the column.
Look at the rows or columns that run through all three mini-grids.
If a row or column has only one empty box where you can place the number you picked, the number belongs in the box. Write the number in the empty box.
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How To Play Sudoku - Solving Numbers In A Mini-Grid
When a mini-grid is missing some number, you maybe able to look at the rows and columns that run through the mini-grid to solve the missing numbers.
Move your finger around a mini-grid to determine which numbers from 1
to 9 are missing.
Make a note of the missing numbers.
Pick one of the empty boxes in the mini-grid. Look at the row and column that run through the empty box in the mini-grid.
Determine if any of the missing numbers you wrote down appear in the row or column.
You will hopefully be able to use this method to fill in all of the missing numbers in a mini-grid. If the sudoku does not give you enough information to figure out one or more of the missing numbers, the empty boxes in the mini-grid will have to remain unsolved for now.
If the row or column already contains one of the missing numbers,
you cannot place the number in the empty box. Cross the number off your list of missing numbers.
If you are left with only one missing number, this number is your answer. Write the number in the empty box. To solve the other missing numbers in the mini-grid, repeat steps 1 to 7.
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How To Play Sudoku - Solve A Shared Missing Number
Here is a trick you can use when a mini-grid and a row or column that runs through the mini-grid both share a missing number. Hopefully,
you will be able to discover the missing number using this simple trick.
Look for a mini-grid and row or column that share one missing number.
Move your finger around the mini-grid to determine which numbers from 1
to 9 are missing. Make a note of these number.
When you look at the list of missing numbers for both the mini-grid and row or column, if the lists share only one missing number, you can fill in the shared number right away. However, if the lists share more than one missing number, you cannot fill in any numbers right now.
Move your finger along the row or column that runs through the mini-grid to determine which numbers from 1 to 9 are missing. Make a note of these numbers.
Look at the list of missing numbers for both the mini-grid and the row or column. If only one number appears in both lists, this number belongs in the empty box shared by both the mini-grid and the row or column.
Write the missing number in the shared empty box.
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