Sudoku is a popular
puzzle consisting of a grid of 9 by 9 numbers.
Each grid number is in the range 1-9 which can
only occur once in any row/column combination
and the 3x3 square in which it resides.
This free online Sudoku helper tool allows you
to try and see the effect of different combinations
of numbers.
Step 1 - Select
and enter the numbers you know into the grid
to the left from the dropdown menus.
Step 2 - Click
the button below to
The numbers in circles show how many different
numbers could go into a grid square, e.g. 
might mean the 4 numbers 2,5,6,9. Look at the
dropdown menu to see the actual values. When
the number of combinations drops to 3 or less
the actual numbers are displayed.
If only one option to fill a grid square is
left the cell goes green.
Otherwise the possible numbers are displayed
in a list and you can choose from the dropdown
menu and try it. Use
the forward and back buttons in your web browser
to try different variations.
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