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Do you remember when there was only 1 type of sudoku puzzle?  It was a straightforward (or often not so easy) 3x3 grid using only the numbers 1 to 9.  Now, as the sudoku craze is sweeping the globe, new sudoku varieties are coming out of the woodwork.  There are now so a lot of variations on the original sudoku game, that newbies just dont know exactly where to begin.  Here is a quick guide to some of the newer sudoku variations with simple guidelines.
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Common Sudoku: This is the original sudoku game (also named Number Location).  It is also referred to as a 3x3 (three mini-grids across, three mini-grids down).  Every mini-grid, row, and column must contain the numbers 1 through 9.  There can be no duplicates in any row, column, or min-grid.

Sudoku 4x4 and 5x5:  This is related to a normal sudoku, but there are either 4 mini-grids across and down, or five mini-grids across and down.  The 4x4 variation normally makes use of the numbers 1 by way of 16, though some versions also add in letters.  The 5x5 version utilizes both numbers and letter.  Once more, no duplicate letters or numbers are permitted in rows, columns, or mini-grids.

Sudoku-X:  The X element in this puzzle is basically the addition of one rule:  Every single of the two corner-to-corner diagonals need to not have duplicate numbers.  So, in a 3x3 sudoku-x, every single column, row, mini-grid, AND the two diagonals will have the numbers 1 via 9.

Alphadoku:  Equivalent to a standard sudoku but makes use of letters of the alphabet as an alternative of numbers.  How a lot of numbers utilized will depend on how many mini-grids are across and down.

Samurai Sudoku:  Normally, 5 regular sudoku puzzles are joined together in the middle.  The very first 4 complete sudoku puzzles are placed separately, with the fifth puzzle placed in the really center sharing a mini-grid with each of the other four.  Every full puzzle can be worked separately, but they should all follow the rules of the regular sudoku.

Killer Sudoku:  A killer sudoku demands simple adding.  There will still be rows, columns, and mini-grids, but the individual squares (or cells) of the puzzle will be connected (either by color or by dotted lines).  There is a modest quantity in the upper corner of the connected cells.  The numbers that go in every of the connected cells need to add up to this number.  Killer sudokus nonetheless follow all the exact same rules of distinctive numbers.

Irregular Sudoku:  These puzzles do not have square mini-grids they are irregular in shape but should nevertheless contain all the numbers 1 although 9.  Common row and column guidelines apply.  Whilst these puzzles are not any far more tough than a normal sudoku, it does take a whilst to train your eye to recognize an irregular mini-grid shape.

As time goes on, sudoku authors generate new sudoku variations and even combine the above sudoku games into a new puzzle.  Envision a Killer Sudoku X Samurai with Irregular mini-grids.  Now THAT sounds like a challenge!