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The rules of X-Sudoku are exactly the same as a normal Sudoku puzzle, but there is one more rule
that you need to follow,

- Both the diagonals must contain the numbers 1-9 once and only once.

This is an example of a X-Sudoku puzzle. You can use all the normal techniques you would use to
solve a Sudoku puzzle, but you can also take the two diagonals in to account.

Look at the highlighted cell in this puzzle. We can eliminate the values 1, 2, 4, 6, 7 and 9 using the normal
rules of Sudoku.

If you look at the values already in that diagonal, we eliminate the values 2(again), 3, 5 and 9(again).
This just leaves us with the value 8. This cell must be 8!

You can also fill in the two highlighted cells. The center cell is on both diagonals, so make sure you
consider both diagonals!

Nonograms

Wordsearch

Nurikabe

Jigsaw Sudoku

Samurai Sudoku

Sudoku

Mathdoku

16×16 Giant Sudoku

Hitori

X-Sudoku

Kids Sudoku

12×12 Giant Sudoku

Hyper Sudoku

Futoshiki

Towers

Killer Sudoku

Greater Than Sudoku

Maze

Arrow Sudoku

Center-Dot Sudoku

Consecutive Sudoku

Odd-Even Sudoku

SudokuXV

Network

Minesweeper

Hashi

SlitherLink

TicTacToe

CellBlocks

Suguru

Kakuro

Train Tracks

Battleships

Masyu

Light Up

Shakashaka

Fillomino

Numberlink

Suko

SetSquare

Dominosa

Spiral Galaxy

Hidoku

Star Battle

Kakurasu

Ballsort

HexaBlocks

SquareBlocks

TriangleBlocks

Picross

Solitare

Pairs

Four in a row