Binary Worlds offers at his web site http://www.BinaryWorlds.com/sudoku/ free Sudoku Smurai puzzles for download and print.
Samurai Sudoku (known in Japan as Gattai 5), is a variation on the 9 by 9 grid theme. The puzzle consists of five grids, one in the centre and the other 4 overlapping each corner grid of the central one. This means that your numbers must be placed correctly for all the five puzzle squares. This form of the puzzle has become very popular. ‘The
Times’ and ‘El País’ feature Samurai Sudoku puzzles.
Pablo Puente
Binary Worlds SL