Sudoku may seem difficult at first glance, but actually it is not as hard as it looks!
The aim is to fill in the whole grid - and depending on the difficulty of the puzzle this can be quite easy (just counting and checking), or later on for more tricky puzzles require a bit more logic and reasoning.
The Rules of Sudoku
Fill a number in to every cell in the grid, using the numbers 1 to 9
You can only use each number once in each row, each column, and in each of the 3x3 boxes
Take a look at this incomplete puzzle...
The three red questionmarks are in places where there is a missing value - but it is easy to see which number to place in each.
If the rest of the line or box is complete, then by a process of elimination, you know which value must be left!
In this case, the only number missing from the horizontal row is a 3.
The number missing from the vertical column is a 9.
The value missing from the box is a 4!
Getting Started - its easy!
Until you've had lots of practise filling out puzzles, here are some questions that you can ask as you play to help you to make progress:
- Where could I place the value X in this row / this column / this box ? (Go through the numbers 1 to 9, and scan to see if the number is already in that row / column / box)
- What value could I put in this cell? (If there's just one acceptable - put it in!)
- What row / column / box is nearly full, and can I fill it?
Finally some thoughts:
- Don't Panic! The solution is in there somewhere!
- Don't Guess! For everything up to expert level, you don't need to guess!
- Don't Worry! It might look hard to begin with, but as you fill in more it gets easier and easier
For lots more help and explanations about Sudoku, visit our main website : Sudoku Of The Day