Sudokus
Sudoku-X
Cage-Sum (aka Killer) Sudokus
MiniSum
Downloads
Christmas Puzzles

In standard**SUDOKU** puzzles (as on the left),
the aim is to place the digits from 1 to 9 in each small square so each row, column and 3x3 mini-array
(surrounded by bold lines) contains each digit just once.

With**Sudoku-X puzzles**, it is also
required that each main diagonal contains each digit just once. A 'correct'
Sudoku-X will not be soluble unless use is made of the additional diagonal requirements (i.e. you will not
be able to fill it in fully if you treat it like a standard Sudoku).

The**Books** page lists collections of both types of puzzles.
The **Downloads** page offers a free Windows-compatible Player program for Sudoku/-X
puzzles, as well as downloads of the puzzles featured here.

I also set**Killer Sudoku** puzzles
(which, despite the name, are not necessarily difficult!). These involve Sudoku grids in
which no squares are pre-filled in but in which meshes are used to surround given areas, the
sum of all contained square values being indicated.

Sudokus - Easy (top), Medium (middle), Hard (bottom)

See also the small variant based on sums - click **here** or on MiniSum above.

In standard

With

The

I also set