How to make your own Sudoku puzzles

Step 13 - Fill in 4s.
	In the column with the dotted line, only the marked cell is a possibility for a 4. Also, in the top center block, possibility for a 4 is only in the marked cell.
	The rest two 4s are fixed at cell J, and therefore, cell K.
	There were two possible cells for a 3 in the top left block. But now that we have a 4 in one of them, the other cell becomes 3.
	We've settled four numbers: 1s, 3s, 4s and 7s.
Step 14 - Carefully fill in 2s and 8s.
	When you look at the row of cell L, L can accept only a 2 or a 8. If we place a 2 or 8 on cell M as well, cell L and M hold the same numbers. Let's say we put 2s to both cell L and M.
	Then cell N and O become 8, and cell P becomes 2. Furthermore, cell Q is 2 and cell R is 8.
	We have come to more than halfway. Let's check if any vacant cells are in fact fixed or not. This is very important: if we don't check that, we might ruin the puzzle!
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