Sample Solution – Step 4
Now
put a 2 in cell A1 and press the 
button.
The
“This is an invalid Sudoku grid” message appears. This means that
the choice of a 2 in cell A1 was wrong.
In
some cases it may attempt to solve the puzzle, in which case you will need to retrieve
to partially solved puzzle from the Rough Work sheet (using the select copy
& paste functions used before) and paste it back into the Sudoku Grid. However,
in this case, simply click OK and continue to the next step. Click here for next step.
Click Here to return to main
screen