How To Solve SuDoku Puzzles
The rest of this tutorial is for novices who would like to see the entire solution covered.
Looking over the grid we can see that block 6 requires a 2 and since column 8 and row 6 already contain a 2, we can eliminate all the cells in the block except the one in the upper right-hand corner, so enter a 2 there.
Now column 9 is missing the 3, 4, 6 and 9. There is already a 9 in block 9 so the 9 must go in the bottom-right cell of block 6.
Looking at the bottom cell of column 9, we can eliminate the 3 and 4 as they both appear in row 9, so the 6 must go there. Placing that 6 eliminates all but one cell for the 6 in block 8. Now there's only one cell for the 6 in column 3 and that eliminates all but one cell in block 4 for the 6 (check the columns, rows and blocks). We can also determine that there is only one cell available for the 2 in column 3.
Now column 3 is missing only a 9 and placing that 9 eliminates all but one cell for the 9 in block 8. Row 4 is now missing only the 3 and 9 and there is already a 9 in block 6 so it must go in block 4 and the 3 in block 6. So the final cell in block 6 must be a 6.
Now let's consider the top-left cell in block 7. By a process of elimination we can dismiss every number except 3 for this cell. (Remember, the 1 and 2 must go in the bottom row.)
Entering the 3 in block 7 now allows us to complete block 9. We can enter the 3 and 4 in block 9 and now columns 7, 8 and 9 are complete. Things will unfold quickly from here on in. Next page>Page 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11