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This is an example of a completed Arrow Sudoku. Arrow Sudoku puzzles take place on a standard Sudoku
grid, but there are added clues in the form of 'total' cells. There are arrows in the grid, and the
number in the circle must equal the total of the numbers along the stalk of the arrow. There aren't any
other restrictions - a number can appear more than once along each stalk, for example.

As an example, take the circled '7' in the top-left region. There are two cells on the stalk of this
arrow, a '6' and a '1', and they do indeed add up to 7. You can check all of the arrows in this
puzzle to make sure they all follow the same rules.

This is a starting grid. I have highlighted 3 cells that we can fill in.

Let's start with the middle cell. This cell is on an arrow stalk that needs a total of 9, and there is
one other cell already filled in on the stalk with a 6. That means this highlighted cell must be 3,
to give us the required total of 9.

Now look at the cell on the right-hand side. Most of this row is actually already filled in - the only
missing numbers are 3 and 8. This cell is also the total cell for an arrow, and we already have a '5'
on the stalk. 3 would be too small here, so this cell must be an 8.

The arrow total cells are normally larger numbers - they have to be. It's always a good idea when
starting a new puzzle to look at the total cells quite early on. In the highlighted cell on the left
side of the puzzle, we can already eliminate 1, 2, 4, 5, 7, 8, and 9 from the possible numbers, leaving
only 3 and 6 for this total cell. If this cell was a 3, then that would mean the missing cell on the
stalk would have to be a 2, but we already have a 2 in this column, so that can't be the case. The only
option left is 6.

This is another starting grid, and I have highlighted three cells that we can fill in straight away.
See if you can fill in the highlighted cell!

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

Shakashaka

Picross