If you are a sudoku fan, you will probably already have lots of experiencing of solving puzzles and know about how the game works. Creating your own sudoku puzzles is fairly straightforward and it can be fun to see other people pitting their wits against your creations!
Try to have between 28 and 30 squares filled in, leaving the rest blank. The first thing to do is to create the solution so you know which numbers go where and then remove some of the numbers to give you 28 to 30 filled squares.
If you want to create a symmetrical puzzle (it looks better, like a crossword grid, but is not compulsory), you must make sure you remove mirror pairs. For example if you remove the number second in on the left on the very top line, you need to remove the number second in from the right on the very bottom line.
Once you have prepared your puzzle, you need to test it to make sure there is only one possible outcome (and to make sure it is solvable!) If there is more than one single solution, it is an invalid puzzle and you need to start again from scratch.
When you have created your masterpiece, you might wish to assign it a grade, depending on its level of difficulty. An easy sudoku puzzle tends to be simple to do and feature only singles and naked singles (meaning you can work out what goes where by process of elimination fairly quickly). Hidden singles mean that if you pencil in what can potentially go into which square, you might find there is only one, for example, which can contain an 8. Therefore, the 8 must go there. If your puzzle contains hidden pairs, you might want to grade it medium.