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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

Cell Blocks

Suguru

Kakuro

Train Tracks

Battleships