Easy Sudoku can be solved by searching for cells with only one possible number, which can then be marked right away.
You can solve all the easy Sudoku puzzles with the following techniques. Sudoku Online game has plenty of easy Sudoku puzzles.
If a row, column, or box is missing only one of the numbers between 1 and 9, and that's clearly the only possible one.
The Sudoku in the picture is still missing three numbers, where the green cells indicate the last numbers. Can you finish the Sudoku?
The only number means that some cell has only one possible candidate number, which you can obviously mark right away.
Which are the only numbers in the green boxes?
A hidden number can fit in a row, column, or box just into one cell and that’s where it must belong.
Can you deduce the hidden numbers in the green cells just by logic?
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