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A Consecutive Sudoku is based on the same rules as a standard Sudoku grid. However, you will also find
a thick grey line separating some cells, the two cells either side of this separating line are
consecutive, i.e. there is only a difference of 1 in their values.

This is an example of a completed Consecutive Sudoku puzzle. You will notice that every thick grey line
has two numbers either side that are only different by 1.

This is a Consecutive Sudoku starting grid, and we can fill in the hilighted cells. The easiest cells to
start with in a Consecutive Sudoku are those that are 'consecutive' with a 1 or a 9 - there is only
one possible solution in this situation, either a 2 or a 8 respectively. We can use this to fill in
the top and bottom highlighted cells.

The highlighted cell to fill in on the center-right is a little trickier to fill in. We can use the
normal rules of Sudoku to eliminate 1, 2, 3, 4, 6, 7, and 8. This leaves us with just 5 and 9. We
also know that this number be must be consecutive with 6, i.e. 5 or 7. This allows us to fill this
cell in with a 5.

This is another Consecutive Sudoku starting grid, can you find the value of the hilighted cell by
combining the standard Sudoku rules with the rules for Consecutive Sudoku?

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

Fillomino

Numberlink

Suko

Picross

Solitare