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Fri, 31 Mar 2017

Graeco-Latin Sudoku

Graeco-Latin Sudoku Instructions:
Here's how to play Graeco-Latin Sudoku:
Graeco-Latin sudoku requires you to place the numbers 1 - n and the letters A - n exactly once in each row and column of the grid.

For instance, with a 5 x 5 puzzle, then the letters A, B, C, D, E and the numbers 1, 2, 3, 4, 5 are to be placed exactly once in each row and column. Each cell contains both a letter and a number.

In addition, each cell must contain a unique combination. Thus if a cell contains 'B5' then no other cell in the puzzle can contain 'B5'.

It's all Graeco-Latin To Me...

Most people will not have encountered Graeco-Latin sudoku before. The reason for this is that it is not commonly seen in print.

Whilst the concept of having one value in each cell is pretty much sacrosanct with sudoku, that rule is broken here, and there is a number and a letter in each cell.

However, for those who are experienced sudoku solvers, this will not prove too much of a jolt, and the same rules as for sudoku can be applied to the letters and numbers individually and some progress can be made this way.

To solve these puzzles however you will invariably need to take note of the fact that each combination of letter and number is unique, so with a 5 x 5 puzzle the 25 combinations from A1 through to E5 appears exactly once.

This fact introduces some nice logic, at the simplest level one has already placed 'B1' and have four other cells that contain a 'B' but you have no idea as to their value, then you can eliminate '1' as an option from each of those cells since that combination has already been placed in the grid.

Graeco-Latin sudoku are sometimes called ABCDoku or Greek Latin sudoku.

These puzzles are typically published at a much smaller size than 9 x 9 and 5 x 5 is the most common. That's because having to keep track of 81 unique combinations can become quite tedious, so these puzzles are at their best at around the 5 x 5 size.

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Arrow Sudoku, Calcudoku, Circle Sudoku, Consecutive Sudoku, Futoshiki, HyperSudoku, Irregular Sudoku, Isosudoku, Killer Sudoku, Offset Sudoku, Outside Sudoku, Samurai Sudoku, Star Sudoku, Sudoku, Sudoku X, Toroidal Sudoku

Last updated: 16 Feb 2012

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Sample puzzle:
start Graeco-Latin Sudoku image
Sample solution:
solution Graeco-Latin Sudoku image

View a sample Graeco-Latin Sudoku PDF

Play Graeco-Latin Sudoku Puzzles:

If you like this puzzle, then why not download a PDF magazine of Graeco Latin Sudoku puzzles? The magazine contains 100 5 x 5 puzzles for you to enjoy.

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