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This is an example of a completed Greater Than Sudoku. The arrows between the cells tell you which cells
have the bigger number. A < symbol means the number on the left is smaller than the number on the right.
A > symbol means the number on the right is smaller than the number on the left, and this symbol works
the same way when it is vertically between cells.

Sometimes in a Greater Than Sudoku puzzle you will be given some numbers to start with, but not always.
This is a hard puzzle, so we weren't given any starting numbers, and we weren't even given all the
relations between the cells - you will notice that some of the cells don't have a > or a <
between them.

This is an example of an easy starting grid, we have been given some starting numbers, and we have a full
set of relationships between cells.

I have highlighted a cell on the left, there is a '2' in the cell below, and we know from the ^ that the
highlighted cell must be smaller, so the hilighted cell must be a '1'. There is another '1' we can insert
in to this grid, try to find it!

I have also highlighted three cells on the right-hand side of this grid. We can't insert any numbers here,
but all three cells are smaller than 4, and there are exactly 3 numbers smaller than 4. This means we
know that these cells must contain the numbers 1, 2 and 3, we don't know the exact placement, but we can
insert some pencil marks.

We can also insert a '3' in the bottom-left 3x3 region, try to find where!

This is an example starting grid for a medium puzzle. We haven't got any starting numbers, but we do
have a full set of relations. The best approach with medium and difficult puzzles is to insert any
pencil marks that you can work out.

Look at the highlighted cell, if you chain all of the >, < and their vertical equivalents together,
you will see that we know this cell is bigger than all of the other cells apart from the bottom-right cell.
This means the highlighted cell must be 8 or 9.

When looking for a starting point in a Greater Than sudoku puzzle, the best numbers to start with are the
high and low numbers, i.e. where could the '1' and the '9' go? After filling in some pencil marks.

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