The home of Mind twister Sudoku software
When no further numbers can be discovered scanning stops and from this point it is necessary to use logical analysis. Many players find it useful to help this analysis by marking candidate numbers into the blank cells. These can be divided into two notation types:.
In the subscript notation the candidate numbers can be written in subscript in the empty cells. If the original puzzle is too small to carry this out (most newspapers are printed with cells that are too small to accommodate more than a few digits of normal handwriting) it may be sensible to make a larger copy of the puzzle.
The other notation is where the player uses a series of dots to represent the numbers 1-9, with 1 being a dot in the top left hand corner of the cell and 9 being a dot in the bottom right hand corner. Using a pencil is recommended as misplaced dots can easily lead to confusion.
When using the marking system a couple of similar rules applied in a specific order will solve any Sudoku puzzle, with no need to backtrack.
Usually the puzzle is a 9×9 grid, made up of 3×3 subgrids called ‘regions’. Some cells contain numbers and these are called ‘givens’. The object of the game is to fill in the empty cells so that each column, row and region contains the numbers 1-9 only once. In each of the three ’scopes’ or ‘directions’ each number occurs only once therefore, thus the ’single number’ implied by the name of the puzzle. There is no mathematical solution to the puzzle; it is completed more through logical reasoning. The level of difficulty has very little to do with the number of givens within a grid, it is more the positioning of the numbers as opposed to the quantity.
This is the website that gets your grey cells working and hopes to bring you some interesting and challenging puzzles, starting with Sudoku. We are addicted to all sorts of puzzles and brainteasers and we welcome any new or interesting contributions from our members. The idea is to twist your brain with logical and interesting conundrums, puzzles and games to keep you entertained for hours.