A sudoku puzzle is a grid of nine large squares, each divided into nine smaller squares.

The objective of sudoku is to enter the numbers 1 to 9 in each smaller square, in such a way that:

• Each horizontal row (shown in blue) contains each number only once

• Each vertical column (shown in purple) contains each number only once

• Each larger square (shown in yellow) also contains each number only once

 

A sudoku puzzle has only one solution, Solving it requires only simple logic. No knowledge of mathematics is required.

 

In each sudoku puzzle, several numbers are pre-entered, these may not be changed.

The aim being to fill the remainder of the puzzle with numbers, following the rules above. Click on any not pre-entered square and you will be given a choice of actions.