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How to play
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.
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If you want to play a different puzzle, go to the archive page and choose your puzzle.
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.
Playing with a mouse/touchscreen.
- 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.
Playing with a mouse and keyboard.
- 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.
Any mistakes you make will be hilighted in red. The website will know when you have completed a puzzle and will tell you.
If you have an account and are logged in, the website will remember that you have completed that puzzle.
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