Sudoku Puzzles: Medium
The modern version of Sudoku was invented in 1979 by Howard Garns in USA
(where it was called `Number Place'). It became really popular in Japan in the
1980s and in the UK since late 2004. It is now quickly spreading worldwide. The
word Sudoku is an abbreviation of a phrase which means “the digits must occur
The aim of a Sudoku puzzle is to fill in the grid so that each row, each column
and each box contains all the numbers from 1 to 9. Usually the grid is 9 by 9,
using the numbers from 1 to 9, but the easier grids are smaller, using numbers
from 1 to 4 or 1 to 6.
Simple eh! Of course not! Sometimes it is easy but often it can be fiendishly
difficult. But it's fun to learn strategies for yourself by just having a go!
There are several levels of difficulty for you to try:
1. Easy. A 4 by 4 grid to start off, leading to a 6 by 6 grid.
2. Medium. 9 by 9 grids, but with plenty of numbers already in place and
some helpful clues.
3. Hard. The hard puzzles h