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This is an example of a completed SudokuXV grid. A SudokuXV puzzle uses the same base rules of Sudoku,
but in addition some cells will have a 'V' or a 'X' between them. In the case of a 'V', these two
cells will add to 5, and in the case of a 'X', these two cells will add to 10.

If you look at this puzzle, you can see that these rules are satisfied.

This is an example SudokuXV starting grid, and I have highlighted some cells that we can either fill in,
or insert some pencil marks. In the topmost cell, it is linked to a '4' by a 'X' symbol. The 'X' tells
us that these two cells must add to 10, so the highlighted cell must be a '6'.

Slightly lower we have another highlighted cell linked by a 'V' to a 1. These two cells must add to 5,
so the highlighted cell must be a 4.

At the bottom of the puzzle we have two highlighted cells linked with a 'V'. We know these two cells
must add to 5, and there's only two ways we can do that, either 1+4=5, or 2+3=5. Because of the 1s and
4s already in these two rows we know that we can't have the combination of 1 and 4 in these cells. We
can then fill in the pencil marks of 2 and 3 for these two cells.

This is another starting SudokuXV grid, can you fill in the highlighted cells? The set of 3 cells in the
bottom right can be filled (i.e. not with pencil marks), hint: Consider the 'V' clue first, and then
consider what possibilities that would leave for the 'X' clue.

There are two ways to play a Sudoku puzzle, you can just use the mouse/touchscreen, or you can use the mouse and keyboard. You can switch between the two methods any time you like, and can use a combination of both.

- When you have found a square where you can enter a number, click/touch that square. The square will turn light blue.

Above and below the puzzle is the number selection. Click/touch the number you want to enter in to that cell. If there is already a number in that square, it will be over-written. - If you want to enter a pencil mark, click/touch the square you want to put in a pencil mark. It will turn light blue.
Click/touch the pencil icon above or below the puzzle. This icon will turn light blue, and you are now in pencil marks mode.

Whenever you click/touch a number now, a pencil mark will be put in the square instead. To remove a number as a pencil mark, make sure you are in pencil marks mode, and click/touch the number again.

You can exit pencil mark mode by clicking/touching the pencil icon, it will turn back to normal. - If you want to clear a particular square, make sure that square is selected and is in light blue. Click/touch the eraser icon. If there is a number in that square, it will be removed. If you click/touch it again, any pencil marks in that square will be removed.

- You will need to select a square by clicking on it with the mouse, it will turn light blue. You can change the current square by using the cursor keys on your keyboard.
- To enter a number, press that number on the keyboard. If there is already a number in that square, it will be overwritten. To remove a number, press the backspace or delete key on your keyboard.
- To enter a pencil mark, press control, shift, or alt on your keyboard at the same time as pressing a number key. Do the same thing again to remove that pencil mark.

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

Picross