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Sudoku-X - Easy (top), Medium (middle), Hard (bottom)
Easy Sudoku-X Puzzle

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

  In standard Sudokus, one aims to place digits 1 to 9 in each small square so rows, columns and 3x3 mini-arrays (surrounded by bold lines) contain each digit once.
  With SUDOKU-X puzzles (as here), it is also required that each of the main diagonals contains each digit once.  A 'correct' Sudoku-X will only soluble if use is made of the additional diagonal requirements (i.e. you can't 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. 

Pick Puzzles
Medium Sudoku-X Puzzle
Hard Sudoku-X Puzzle