What's it all about?
The goal of Sudoku is to fill all the blank squares in the grid with
the correct numbers. In Sudoku Quest, this is done by placing the mouse
over a blank square, left-clicking and pressing a number key 1-9.

How do you know which numbers to place in the empty squares? that's the fun part!
Using logic and deduction, you can always work out which numbers go in which
squares.

Now for the rules:-
All columns, rows and 3x3 blocks must contain all the numbers 1-9, however
they can be in any order, and they do not have to sum up to anything.

Even though Sudoku puzzles use numbers, it has nothing to do with maths at all, you could
substitute the numbers for anything, even pretty pictures.

The numbers must be unique
Columns, rows and 3x3 blocks must not
contain any duplicate numbers. In Sudoku Quest, these will be shown in red
as below. This row has two 8's in it, and therefore is not valid.

Using the pencil
Sudoku Quest allows you to "pencil in" possible values for each square. This
can be very useful and may in fact be required for harder puzzles when using
more advanced Sudoku solving techniques. To use the pencil in the downloadable
version of Sudoku Quest, right-click on a square and press a number key, for the
web game, you must hold the space bar and left-click a square.

Is it a real Sudoku?
It is important to note that a "real" Sudoku puzzle has only 1 unique solution which can
be reached by logical deduction along. If a Sudoku puzzle can be completed in more than one
way, or if you have to guess some of the numbers then it is not a valid puzzle. All of the
Sudoku puzzles on this site are valid.

Where to go from here?
Now that you know how to play, why not try: